Tuning the magnetism of the Heusler alloys Mn3−xCoxGa from soft and half-metallic to hard-magnetic for spin-transfer torque applications

2011 ◽  
Vol 99 (22) ◽  
pp. 222510 ◽  
Author(s):  
Vajiheh Alijani ◽  
Juergen Winterlik ◽  
Gerhard H. Fecher ◽  
Claudia Felser
Keyword(s):  
Heusler Alloys ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Half Metallic

High-power rf oscillation induced in half-metallic Co2MnSi layer by spin-transfer torque

2011 ◽  
Vol 99 (5) ◽  
pp. 052510 ◽  
Author(s):  
R. Okura ◽  
Y. Sakuraba ◽  
T. Seki ◽  
K. Izumi ◽  
M. Mizuguchi ◽  
...  
Keyword(s):  
High Power ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Half Metallic

SPIN TRANSFER TORQUE SWITCHING AND PERPENDICULAR MAGNETIC ANISOTROPY IN FULL HEUSLER ALLOY Co2FeAl-BASED TUNNEL JUNCTIONS

SPIN ◽  
2014 ◽  
Vol 04 (04) ◽  
pp. 1440023 ◽  
Author(s):  
H. SUKEGAWA ◽  
Z. C. WEN ◽  
S. KASAI ◽  
K. INOMATA ◽  
S. MITANI
Keyword(s):  
Magnetic Anisotropy ◽  
Tunnel Junctions ◽  
Heusler Alloys ◽  
Random Access ◽  
Perpendicular Magnetic Anisotropy ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
High Spin Polarization ◽  
Full Heusler ◽  
Full Heusler Alloys

Some of Co -based full Heusler alloys have remarkable properties in spintronics, that is, high spin polarization of conduction electrons and low magnetic damping. Owing to these properties, magnetic tunnel junctions (MTJs) using Co -based full Heusler alloys are potentially of particular importance for spintronic application such as magnetoresistive random access memories (MRAMs). Recently, we have first demonstrated spin transfer torque (STT) switching and perpendicular magnetic anisotropy (PMA), which are required for developing high-density MRAMs, in full-Heusler Co 2 FeAl alloy-based MTJs. In this review, the main results of the experimental demonstrations are shown with referring to related issues, and the prospect of MTJs using Heusler alloys is also discussed.

Introduction of spin torques

2017 ◽  
Author(s):  
T. Kimura
Keyword(s):  
Angular Momentum ◽  
Giant Magnetoresistance ◽  
Spontaneous Magnetization ◽  
Magnetic Domain ◽  
Magnetic Multilayers ◽  
Transfer Effect ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Spin Angular Momentum ◽  
Spin Torques

This chapter discusses the spin-transfer effect, which is described as the transfer of the spin angular momentum between the conduction electrons and the magnetization of the ferromagnet that occurs due to the conservation of the spin angular momentum. L. Berger, who introduced the concept in 1984, considered the exchange interaction between the conduction electron and the localized magnetic moment, and predicted that a magnetic domain wall can be moved by flowing the spin current. The spin-transfer effect was brought into the limelight by the progress in microfabrication techniques and the discovery of the giant magnetoresistance effect in magnetic multilayers. Berger, at the same time, separately studied the spin-transfer torque in a system similar to Slonczewski’s magnetic multilayered system and predicted spontaneous magnetization precession.

scholarly journals Control of Structural and Magnetic Properties of Polycrystalline Co2FeGe Films via Deposition and Annealing Temperatures

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1229
Author(s):  
Andrii Vovk ◽  
Sergey A. Bunyaev ◽  
Pavel Štrichovanec ◽  
Nikolay R. Vovk ◽  
Bogdan Postolnyi ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Post Deposition Annealing ◽  
Structure Variation ◽  
Annealing Temperatures ◽  
Damping Parameter ◽  
Soft Ferromagnetic ◽  
Thin Polycrystalline ◽  
Post Deposition

Thin polycrystalline Co2FeGe films with composition close to stoichiometry have been fabricated using magnetron co-sputtering technique. Effects of substrate temperature (TS) and post-deposition annealing (Ta) on structure, static and dynamic magnetic properties were systematically studied. It is shown that elevated TS (Ta) promote formation of ordered L21 crystal structure. Variation of TS (Ta) allow modification of magnetic properties in a broad range. Saturation magnetization ~920 emu/cm3 and low magnetization damping parameter α ~ 0.004 were achieved for TS = 573 K. This in combination with soft ferromagnetic properties (coercivity below 6 Oe) makes the films attractive candidates for spin-transfer torque and magnonic devices.

Materials, Devices and Spin Transfer Torque in Antiferromagnetic Spintronics: A Concise Review

SPIN ◽  
2017 ◽  
Vol 07 (03) ◽  
pp. 1740014 ◽  
Author(s):  
Cormac Ó Coileáin ◽  
Han Chun Wu
Keyword(s):  
Magnetic Fields ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Tetragonal Structure ◽  
Next Generation ◽  
Tunnel Magnetoresistance ◽  
Spintronic Devices ◽  
Concise Review ◽  
Plane Anisotropy ◽  
Magnetic States

From historical obscurity, antiferromagnets are recently enjoying revived interest, as antiferromagnetic (AFM) materials may allow the continued reduction in size of spintronic devices. They have the benefit of being insensitive to parasitic external magnetic fields, while displaying high read/write speeds, and thus poised to become an integral part of the next generation of logical devices and memory. They are currently employed to preserve the magnetoresistive qualities of some ferromagnetic based giant or tunnel magnetoresistance systems. However, the question remains how the magnetic states of an antiferromagnet can be efficiently manipulated and detected. Here, we reflect on AFM materials for their use in spintronics, in particular, newly recognized antiferromagnet Mn2Au with its in-plane anisotropy and tetragonal structure and high Néel temperature. These attributes make it one of the most promising candidates for AFM spintronics thus far with the possibility of architectures freed from the need for ferromagnetic (FM) elements. Here, we discuss its potential for use in ferromagnet-free spintronic devices.

Possible half-metallic behavior of Co2−xCrxFeGe Heusler alloys: Theory and experiment

2021 ◽  
Vol 104 (1) ◽  
Author(s):  
R. Mahat ◽  
S. KC ◽  
U. Karki ◽  
J. Y. Law ◽  
V. Franco ◽  
...  
Keyword(s):  
Heusler Alloys ◽  
Metallic Behavior ◽  
Half Metallic ◽  
Theory And Experiment

Magnetization dynamics of antiferromagnetic metals of PtMn and IrMn driven by a pulsed spin-transfer torque

2021 ◽  
Vol 118 (25) ◽  
pp. 252407
Author(s):  
Kyuhwe Kang ◽  
Won-Bin Lee ◽  
Dong-Kyu Lee ◽  
Kyung-Jin Lee ◽  
Gyung-Min Choi
Keyword(s):  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Magnetization Dynamics
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