Second harmonic detection of spin dependent transport in magnetic nanostructures article pdf available in chinese physics letters 272 february 2010 with 39 reads how we measure reads. Spintransport and transfer in magnetic nanostructures. Buy spin dependent transport in magnetic nanostructures advances in condensed matter science on free shipping on qualified orders. The discovery of gmr triggered an extensiv e research effort on spin transport in magnetic nanostructures. This page intentionally left blank transport in nanostructures second edition providing a muchneeded update on the l. The plane magnetic nanostructures for the study of the spin transfer effect frank joseph albert, ph. Spin dependent transport in magnetic nanostructures advances.
Introduction magnetization switching processes and spin dynamics in general are fundamental issues in magnetism, and are essential to technological applications such as magnetic storage and spintronics 1,2. We study the spin dependent transport properties of the nanostructures consisting of realistic magnetic barriers produced by the deposition of ferromagnetic stripes on heterostructures. The dependence of magnetic spin and orbital moments and spin correlations on particle size and temperature are of. An important focus of the group focus lies in the investigation of the electronic and magnetic properties of nanostructures at surfaces. We derive a general expression for the spin accumulation signal which covers from the metallic to the tunneling regime. Coherent electronic transport through a molecular device is studied using nonequilibrium greens function negf formalism. Elsevier journal of magnetism and magnetic materials 156 1996 315316 invited paper iii journal of magnetism and magnetic materials spindependent transport in magnetic nanostructures s.
This book introduces and explains the basic physics and applications of a variety of spindependent transport phenomena in magnetic nanostructures with particular emphasis on magnetic multilayers and. In this sense, the spin charge separation of electrons is a starting point for the physics of spinelectronics. This increases the effect of spin dependent scattering on the electrons passing through the. As the graphene flake becomes small and is more isolated by the boron nitride region, the magnetic ordering of the flake increases. We discuss spindependent electron spill out and demonstrate in a combined theoretical and experimental work that compelling consequences for spinpolarization and spindependent transport arise at the edges of magnetic nanostructures due to the spindependent smoluchowski. An efficient algorithm is developed to solve the scattering problem numerically. Cornell university 2003 this dissertation describes the development and use of a set of techniques used to fabricate magnetic nanostructures where a current can be applied perpendicular to the plane of the thin. Spindependent quantum interference within a single magnetic.
The spin asymmetry of schottky barriers may result in different tunneling rates of spin up and down electrons, and then lead to spin polarized current, namely spin filter sf effect. This method eliminates the dominating resistivity component of the magnetic response and thus reveals an intrinsic spin dependent process. The study presented in this thesis is concerned with the spin dependent transport and spin transfer in magnetic nanostructures. This is because the spindependent tunneling between the dots are governed by the field. Spin dependent thermoelectric effects in magnetic nanostructures.
Spindependent transport in antiferro and ferrimagnetic nanostructures. In magnetic superlattices, magnetic and nonmagnetic metallic thin films with thickness of the order of one nanometer are piledup alternately. Cornell university 2012 this dissertation describes a number of research projects with the common. Manufacture, physics, devices, and modeling, march 9, 2008 department of physics, new york university andrew d. Spin injection and detection in magnetic nanostructures. Request pdf spin dependent transport in antiferro and ferrimagnetic nanostructures spin transfer torque stt and tunnelling magnetoresistance tmr in magnetic tunnel junctions with. We use these strayfield effects for detailed studies on the magnetic properties of rectangular micromagnets, nanodisks and nanorings. Abstract a quasi onedimensional model of spin transport in heterogeneous. Quantum transport in noncollinear magnetic nanostructures. When two magnetic dots are embedded in a nanowire, the single electron tunneling process may be controlled by the magnetic field. We study theoretically the spin transport in a nonmagnetic metal connected to ferromagnetic injector and detector electrodes. A second driver for the growth of the study of spin transfer effects is that experimental fabrication techniques have only recently been developed that allow devices to be readily made at the sub 100 nm dimensions. Spin transport and current induced magnetization dynamics in. Spinpolarized transport in magnetic nanostructures.
The first two chapters are dedicated to introduce spinelectronics, electrical transport and the experimental techniques commonly used in this work. The nanostructures might be favorable candidates for ferromagnetic contacts in future spininjection experiments. The dependence of magnetic spin and orbital moments and spin correlations on particle size and temperature are of interest. Spin transport in magnetic tunnel junctions quantumatk q. Recent theoretical studies predicted that local spin polarization on nonmagnetic surfaces as well as on magnetic nanostructures can be. The occurrence of inhomogeneous spin density distribution in multilayered ferromagnetic diluted magnetic semiconductor nanostructures leads to strong.
This method eliminates the dominating resistivity component of the magnetic response and thus reveals an intrinsic spindependent process. A dissertation submitted to the faculty of the graduate school of the university of minnesota by xi chen in partial fulfillment of the requirements for the degree of doctor of philosophy randall h. The charging energy of a metallic grain called a dot embedded in a nanowire causes the single electron tunneling. The complexity associated with the classical quantum. Spindependent transport in magnetic nanostructures is based on the physics of the interaction between spin and charge. Spin transport in magnetic nanostructures listed as stmn. The 2nd gordon research conference and 1st gordon research seminar on spin dynamics in nanostructures will provide an important stage for the main players in the field and those who want to joint them to present and discuss new results and future plans, in.
Spin transport and current induced magnetization dynamics. With gmr, the resistance of a magnetic multilayer is affected by the relative orientation of its magnetic layers due to electron spin dependent scattering. The aim of this thesis work was to obtain a deeper understanding of spindependent transport by the study of mixed effects of heat and charge currents in magnetic nanostructures. Remaining sections are devoted to transport studies on double quantum dot. Spindependent transport in nanostructures candidato dr. Spin dependent transport in magnetic nanostructures. Coherent electronic transport through a molecular device is studied using non equilibrium greens function negf formalism. Nanosciences and nanotechnologies magnetism of nanostructures k. Spin tunnel junctions have two magnetic electrodes separated by an insulating tunnel barrier made from aluminium oxide 36. Especially interesting are recently discovered twodimensional magnetic vdw materials, providing new paradigms for spintronic applications.
Transport in nanostructures magnetic microscopy of nanostructures. Special attention is paid to the spin accumulation and spin current caused by spin injection into nonmagnetic metals and semiconductors and superconductors. Spinorbit induced dynamics in multilayer nanostructures. Handbook of spin transport and magnetism provides a comprehensive, balanced account of the state of the art in. The 2nd gordon research conference and 1st gordon research seminar on spin dynamics in nanostructures will provide an important stage for the main players in the field and those who want to joint them to present and discuss new results and future plans, in theory, computation, simulation, and experiments. Two of the principal phenomena observed and exploited in the field of spintronics are giant magnetoresistance gmr and spin transfer torque stt. Special attention is paid to the spin accumulation and spin current caused by spin injection into non magnetic metals and semiconductors and superconductors. Request pdf spindependent transport in antiferro and ferrimagnetic nanostructures spin transfer torque stt and tunnelling magnetoresistance tmr in magnetic tunnel junctions with. Firstprinciples study on the electronic structure and transport property of the boron nitride sheet bnc structure, in which a triangular graphene flake surrounded by a hexagonal boron nitride sheet, is implemented. Together, gmr and stt are at the foundation of numerous technologies, and they hold promise. The first two chapters are dedicated to introduce spin electronics, electrical transport and the experimental techniques commonly used in this work. Spin transport and current induced magnetization dynamics in magnetic nanostructures. Spin transport in magnetic nanostructures, the american journal of physics on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
Spindependent transport in antiferro and ferrimagnetic. We employ landauers formalism to study spin dependent electron transport in structures like spin valve, magnetic tunnel junction and nanowires. It neglects that electrons in addition to charge also carry a spin. I will introduce this method in the following chapter. Here, using density functional theory dft calculations, we investigate the spindependent electronic transport across vdw magnetic tunnel junctions mtjs composed of fe3gete2 ferromagnetic electrodes and a graphene or hexagonal boron nitride hbn spacer layer. Features of the current spinorbit induced magnetic dynamics in multilayer nanostructures with nonmagnetic heavy metal layers possessing by a strong spinorbit interaction are studied. Functional approximation for the spin dependent quantum transport in magnetic nanostructures aip conference. Spin dependent transport in magnetic nanostructures crc press book in magnetic systems of nanometer size, the interplay between spin and charge of electrons provides unique transport phenomena. This book introduces and explains the basic physics and applications of a variety of spin dependent transport phenomena in magnetic nanostructures with particular emphasis on magnetic multilayers and. It may enhance the transport of spin up electrons, and improve sf.
In conclusion, we have proposed the spin blockade for the single electron tunneling. Nanomagnetism and spintronics is a rapidly expanding and increasingly important field of research with many applications already on the market and many more to be expected in the near. The discovery of gmr triggered an extensive research effort on spin transport in magnetic nanostructures. The magnetic thin films and multilayers can be considered as nanostructures 23. Firstprinciples study of spindependent transport through. When confined to magnetic nanostructures, an imbalance between electrons of opposite spin orientations leads to spin polarized electron waves, giving rise to spin dependent quantum interference. Magnetic nanostructures 1 emil burzo magnetic nanostructures. Radiation effects on the magnetism and the spin dependent. In magnetic systems of nanometer size, the interplay between spin and charge of electrons provides unique transport phenomena. Spindependent tunneling in nanostructures consisting of.
Theory of spindependent tunneling and transport in magnetic nanostructures invited. Currentinduced magnetization switching cims due to spintransfer torques is an advanced switching concept for magnetic nanostructures in spintronic devices. Spindependent transport through a quantum wire with. This resource letter provides a guide to the literature in the still rapidly developing area of spindependent transport phenomena, which forms the basis for applications in magnetoelectronics. This enables us to discuss recent controversy on spin injection and detection experiments. Spintransport and transfer basics giant magnetoresistance gmr spin filtering and spin momentum transfer ii. Unlike in spin valves, the current flows through the junction perpendicular to the layers fig. The aim of this thesis work was to obtain a deeper understanding of spin dependent transport by the study of mixed effects of heat and charge currents in magnetic nanostructures. We observed spindependent quantum interference by means of spinpolarized stm spstm 6, a technique sensitive to surface magnetization. Thermal spin injection describes the injection of spins in a nonmagnetic.
You will use quantumatk to study the colinear and noncolinear spindependent transport properties, including electronic transmission, tunnel magnetoresistance, and spintransfer torque. Surface roughness is known to be an important source of scattering in small structures. Such device is made of atomic nanowire which is connected to ferromagnetic electrodes. Regarding magnetism transition metal and rareearth atoms, metaloxydes etc. Enhanced magnetic field sensitivity of spindependent. In a device containing a superconductor f1sf2, the e. Spin transport in magnetic nanostructures how is spin transport in magnetic nanostructures abbreviated. Characterization of spin transfer torque and magnetization manipulation in magnetic nanostructures chen wang, ph. Magnetic nanostructures for lateral spintransport devices. The magnetizations of f1 and f2 are aligned either parallel or antiparallel. Timedomain measurements address the question of how fast a.
Spin dependent transport in magnetic nanostructures crc. The focus upon single electron tunneling remains, but considerable new material on coupled dots has been added. It is shown that, only in the nanostructures with symmetric magnetic field with respect to the magnetic modulation direction, electrons exhibit a considerable. Spindependent transport in magnetic nanostructures sciencedirect. Spin transfer torques in high anisotropy magnetic nanostructures eric fullerton1, jordan katine2, stephane mangin3. Spin injection and nonlocal spin transport in magnetic. Spindependent schottky barriers and vacancyinduced spin. The phenomena also depend on the geometry of the devices. Shinjo spin dependent transport in magnetic nanostructures. The enhancement is also expected in semiconductor devices. Elsevier journal of magnetism and magnetic materials 156 1996 315316 invited paper iii journal of magnetism and magnetic materials spin dependent transport in magnetic nanostructures s. Then, chapter 7 discusses weakly disordered 9780521877480 transport in nanostructures, second edition. Cornell university 2007 in this thesis, i have employed point contact spectroscopy to determine the nature of electron transport across constrained domain walls in a ferromagnetic nanocon.
Inoue department of applied physics, nagoya unirersity. Radiation effects on the magnetism and the spin dependent transport in magnetic materials and nanostructures for spintronic applications volume 30 issue 9 jiwei lu, s. The nanostructures we study are triangular co islands located on a nonmagnetic. He has recently served on the aip steering cmte for magnetic materials, and as a committee member. Quantum transport in semiconductor nanostructures pdf. Using stateoftheart commercial and homemade density functional theory and kinetic monte carlo codes software we study, among other things, electronic properties of nanoscale surface structures, and spin dependent effects therein, to better understand. Read spindependent transport through a quantum wire with magnetic impurity, journal of shanghai university english edition on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. It is shown that, only in the nanostructures with symmetric magnetic field with respect to the magneticmodulation direction, electrons exhibit a considerable. Spin dynamics and spin transport jurgen lindner, daniel e. Spindependent transport in magnetic nanostructures. Spin dependent transport in magnetic nanostructures crc press. Bennemann encyclopedia of life support systems eolss note, in nanostructured thin films magnetic domain structure is frequently present and the reversal of a domain magnetization may be relatively slow. The spinpeltier effect describes spindependent heat transport across this interface.
In summary, these are some cluster like nanostructures. Spinpolarized transport in ferromagnetic multilayered. For the stt effect, a spinpolarized electric current is used to alter the magnetic state of a ferromagnet. Spin dependent transport and spin transfer in nanoconstrictions and current confined nanomagnets ozhan ozatay, ph. Moreover, by introducing x vacancy into crx3gr, an ohmic contact forms in spin up direction. In order to do this, an original experimental setup was developed which allows to.
Chapter 6 focuses upon quantum dots with new material on the role of spin. Spindependent transport through magnetic nanojunctions. The molecule itself is described with the help of hubbard model coulomb interactions are treated by means of the hartreefock approximation, while the coupling to the. Spindependent quantum interference within a single.
We study the spindependent transport properties of the nanostructures consisting of realistic magnetic barriers produced by the deposition of ferromagnetic stripes on heterostructures. In this chapter is developer a formalism to study quantum networks of generic shape in presence of rashba effect and magnetic field. Perpendicular transport of spinpolarized electrons through. In magnetic superlattices, magnetic and non magnetic metallic thin films with thickness of the order of one nanometer are piledup alternately. These structures include ferromagnetic f antiferromagnetic afnormal metal n nanostructures based on both conductive and insulating magneticsand heavy normal metals e. The occurrence of inhomogeneous spindensity distribution in multilayered ferromagnetic diluted magnetic semiconductor nanostructures leads to strong. Indeed, even thermodynamics establish a relationship between both currents, no previous works were performed in this sense up to now. A variety of phenomena induced in nanosuperconductorferromagnet devices are proposed, examining the spincharge separation in. In the past several decades, the research on spin transport and magnetism has led to remarkable scientific and technological breakthroughs, including albert fert and peter gra. Polarized neutron reflectometry with polarization analysis is a method for depthresolved investigation of magnetic layered st ructures. Spin transport in magnetic nanostructures how is spin. Spin transport in magnetic nanostructures hathaway, kristl. Spin dependent transport in magnetic nanostructures pdf.
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