Experimental determination of spin-transfer torque nonadiabaticity parameter and spin polarization in permalloy

2009 ◽  
Vol 79 (9) ◽  
Author(s):  
S. Lepadatu ◽  
M. C. Hickey ◽  
A. Potenza ◽  
H. Marchetto ◽  
T. R. Charlton ◽  
...  
Keyword(s):  
Experimental Determination ◽  
Spin Polarization ◽  
Spin Transfer Torque ◽  
Spin Transfer

scholarly journals Magnetic droplet nucleation boundary in orthogonal spin-torque nano-oscillators

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
Sunjae Chung ◽  
Anders Eklund ◽  
Ezio Iacocca ◽  
Seyed Majid Mohseni ◽  
Sohrab R. Sani ◽  
...  
Keyword(s):  
Critical Role ◽  
Perpendicular Magnetic Anisotropy ◽  
Accurate Method ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Spin Torque ◽  
Droplet Nucleation ◽  
Wide Range ◽  
Field Plane

Abstract Static and dynamic magnetic solitons play a critical role in applied nanomagnetism. Magnetic droplets, a type of non-topological dissipative soliton, can be nucleated and sustained in nanocontact spin-torque oscillators with perpendicular magnetic anisotropy free layers. Here, we perform a detailed experimental determination of the full droplet nucleation boundary in the current–field plane for a wide range of nanocontact sizes and demonstrate its excellent agreement with an analytical expression originating from a stability analysis. Our results reconcile recent contradicting reports of the field dependence of the droplet nucleation. Furthermore, our analytical model both highlights the relation between the fixed layer material and the droplet nucleation current magnitude, and provides an accurate method to experimentally determine the spin transfer torque asymmetry of each device.

Spin polarization in magnets

2017 ◽  
Author(s):  
K. Takanashi ◽  
Y. Sakuraba
Keyword(s):  
Spin Polarization ◽  
Spin Current ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Energy Band Gap ◽  
Magnetoresistance Effect ◽  
Half Metals ◽  
Conduction Electrons ◽  
Spin Polarized ◽  
Spin Dependent Scattering

This chapter explains how the exchange splitting between up- and down-spin bands in ferromagnets unexceptionally generates spin-polarized electronic states at the Fermi energy. The quantity of spin polarization P in ferromagnets is one of the important parameters for application in spintronics, since a ferromagnet having a higher P is able to generate larger various spin-dependent effects such as the magnetoresistance effect, spin transfer torque, spin accumulation, and so on. However, the spin polarizations of general 3d transition metals or alloys generally limit the size of spin-dependent effects. Thus,“‘half-metals” attract much interest as an ideal source of spin current and spin-dependent scattering because they possess perfectly spin-polarized conduction electrons due to the energy band gap in either the up- or down-spin channel at the Fermi level.

Perpendicular shape anisotropy spin transfer torque-MRAM: determination of pillar tilt angle from 3D Stoner–Wohlfarth astroid analysis

2019 ◽  
Vol 52 (50) ◽  
pp. 505005 ◽  
Author(s):  
N Perrissin ◽  
N Caçoilo ◽  
G Gregoire ◽  
S Lequeux ◽  
L Tillie ◽  
...  
Keyword(s):  
Tilt Angle ◽  
Shape Anisotropy ◽  
Spin Transfer Torque ◽  
Spin Transfer

Self-consistent determination of the key spin-transfer torque parameters from spin-wave Doppler experiments

2014 ◽  
Vol 89 (2) ◽  
Author(s):  
J.-Y. Chauleau ◽  
H. G. Bauer ◽  
H. S. Körner ◽  
J. Stigloher ◽  
M. Härtinger ◽  
...  
Keyword(s):  
Spin Wave ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Self Consistent

Experimental determination of a state equation for dissipative granular gases

1999 ◽  
Vol 96 (6) ◽  
pp. 1111-1116 ◽  
Author(s):  
E. Falcon ◽  
S. Fauve ◽  
C. Laroche
Keyword(s):  
Experimental Determination ◽  
State Equation ◽  
Granular Gases
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