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The tunneling of a giant spin at excited levels is studied theoretically in mesoscopic magnets with a magnetic field at an arbitrary angle in the easy plane. Different structures of the tunneling barriers can be generated by the…

介观与纳米尺度物理 · 物理学 2015-06-24 Rong Lu , Hui Pan , Jia-Lin Zhu , Bing-Lin Gu

The influence of an inhomogeneous magnetic field on the magnetoresistance of thin Al films, used in different superconductor/ferromagnet hybrids, has been investigated. Two contrasting magnetic textures with out-of-plane magnetization are…

超导电性 · 物理学 2009-11-13 W. Gillijns , A. Aladyshkin , A. V. Silhanek , V. V. Moshchalkov

A drastic modification of electronic band structure is predicted in bilayer graphene when it is placed between two ferromagnetic insulators. Due to the exchange interaction with the proximate ferromagnet, the electronic energy dispersion in…

材料科学 · 物理学 2008-04-04 Y. G. Semenov , K. W. Kim , J. M. Zavada

Ability to tailor the nature of the magnetic coupling between two ferromagnetic electrodes can enable the realization of new spintronics device systems. This paper discusses our finding that deposition of an ultrathin tantalum (Ta) on the…

材料科学 · 物理学 2020-08-10 Pawan Tyagi , Tobias Goulet

We consider the influence of a spin accumulation in a normal metal on the magnetic statics and dynamics in an adjacent magnetic insulator. In particular, we focus on arbitary angles between the spin accumulation and the easy-axis of the…

介观与纳米尺度物理 · 物理学 2020-07-01 Dion M. F. Hartmann , Andreas Rückriegel , Rembert A. Duine

We investigate the influence of periodic surface roughness in thin ferromagnetic films on shape anisotropy and magnetization behavior inside the ferromagnet. Starting from the full micromagnetic energy and using methods of homogenization…

数学物理 · 物理学 2017-11-22 Massimiliano Morini , Valeriy Slastikov

The notion of a simple ordered state implies homogeneity. If the order is established by a broken symmetry, elementary Landau theory of phase transitions shows that only one symmetry mode describes this state. Precisely at points of phase…

Tunneling electroresistance (TER) effect is the change in the electrical resistance of a ferroelectric tunnel junction (FTJ) associated with polarization reversal in the ferroelectric barrier layer. Here we predict that a FTJ with a…

材料科学 · 物理学 2009-11-26 M. Ye. Zhuravlev , Y. Wang , S. Maekawa , E. Y. Tsymbal

The transport properties of magnetic tunnel junctions (MTJs) are very sensitive to interface modifications. In this work we investigate both experimentally and theoretically the effect of asymmetric barrier modifications on the bias…

We investigated spin dependent transport through Fe/GaAs/Fe tunnel junctions. The tunneling magnetoresistance effect (TMR) was probed for different types of Fe/GaAs interfaces. For interfaces cleaned by hydrogen plasma the TMR effect is…

介观与纳米尺度物理 · 物理学 2009-11-11 J. Moser , M. Zenger , C. Gerl , D. Schuh , R. Meier , P. Chen , G. Bayreuther , W. Wegscheider , D. Weiss , C. -H. Lai , R. -T. Huang , M. Kosuth , H. Ebert

We study correlations and magnetic textures of localized spins, doped in three-dimensional Dirac semimetals. An effective field theory for magnetic moments is constructed by integrating out the fermionic degrees of freedom. The spin…

介观与纳米尺度物理 · 物理学 2016-04-06 Yasufumi Araki , Kentaro Nomura

This work is devoted to the study of how spin texture excitations are affected by the presence of a static nonmagnetic impurity whenever they lie on a conical support. We realize a number of novelties as compared to the flat plane case.…

强关联电子 · 物理学 2009-11-10 W. A. Freitas , W. A. Moura-Melo , A. R. Pereira

We demonstrate tunnel magnetoresistance (TMR) junctions based on a tri layer system consisting of an epitaxial NiMnSb, aluminum oxide and CoFe tri layer. The junctions show a tunnelling magnetoresistance of Delta R/R of 8.7% at room…

材料科学 · 物理学 2009-11-11 J. Liu , E. Girgis , P. Bach , C. Ruester , C. Gould , G. Schmidt , L. W. Molenkamp

We performed a systematic analysis of the tunneling magnetoresistance (TMR) effect in single grain boundary junctions formed in epitaxial La(2/3)Ca(1/3)MnO(3) films deposited on SrTiO(3) bicrystals. For magnetic fields H applied parallel to…

强关联电子 · 物理学 2009-10-31 J. B. Philipp , C. Hoefener , S. Thienhaus , J. Klein , L. Alff , R. Gross

The physics of Josephson tunnel junctions drastically depends on their geometrical configurations. The shape of the junction determines the specific form of the magnetic-field dependence of the its Josephson current. Here we address the…

超导电性 · 物理学 2016-06-09 Roberto Monaco

We observe a thermally induced spontaneous magnetization reversal of epitaxial ferromagnet/antiferromagnet heterostructures under a constant applied magnetic field. Unlike any other magnetic system, the magnetization spontaneously reverses,…

材料科学 · 物理学 2009-11-11 Zhi-Pan Li , Johannes Eisenmenger , Casey W. Miller , Ivan K. Schuller

Strong ferromagnetic interlayer exchange couplings $J$ in perpendicularly magnetized systems are becoming increasingly desirable for applications. We study whether ferromagnetic interlayer exchange couplings can be measured by a combination…

材料科学 · 物理学 2016-04-22 Thibaut Devolder

We develop a general formalism for analyzing the ferromagnetic resonance characteristics of a magnetic dimer consisting of two magnetic elements (in a horizontal or vertical configuration) coupled by dipolar interaction, taking account of…

材料科学 · 物理学 2015-01-22 A. F. Franco , J. L. Déjardin , H. Kachkachi

We calculate the conductances and the tunneling magnetoresistance (TMR) of double magnetic tunnel junctions, taking as a model example junctions composed of Fe/ZnSe/Fe/ZnSe/Fe (001). The calculations are done as a function of the gate…

介观与纳米尺度物理 · 物理学 2008-09-08 J. Peralta-Ramos , A. M. Llois

Magnetoelectric crystals have the interesting property that they allow electric fields to induce magnetic polarizations, and vice versa, magnetic fields to generate ferroelectric polarizations. Having such a magnetoelectric coupling usually…

介观与纳米尺度物理 · 物理学 2024-01-08 Carmine Ortix , Jeroen van den Brink