scholarly journals Determination of spin torque efficiencies in heterostructures with perpendicular magnetic anisotropy

2016 ◽  
Vol 93 (14) ◽  
Author(s):  
Chi-Feng Pai ◽  
Maxwell Mann ◽  
Aik Jun Tan ◽  
Geoffrey S. D. Beach
Keyword(s):  
Magnetic Anisotropy ◽  
Perpendicular Magnetic Anisotropy ◽  
Spin Torque

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.

Determination of perpendicular magnetic anisotropy based on the magnetic droplet nucleation

2018 ◽  
Vol 57 (5) ◽  
pp. 050308 ◽  
Author(s):  
Tomoe Nishimura ◽  
Duck-Ho Kim ◽  
Takaya Okuno ◽  
Yuushou Hirata ◽  
Yasuhiro Futakawa ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Perpendicular Magnetic Anisotropy ◽  
Droplet Nucleation ◽  
Magnetic Droplet

scholarly journals RF signal detector and energy harvester based on a spin-torque diode with perpendicular magnetic anisotropy

AIP Advances ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 025234
Author(s):  
P. Yu. Artemchuk ◽  
O. V. Prokopenko ◽  
E. N. Bankowski ◽  
T. J. Meitzler ◽  
V. S. Tyberkevych ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Energy Harvester ◽  
Perpendicular Magnetic Anisotropy ◽  
Spin Torque ◽  
Signal Detector ◽  
Rf Signal

scholarly journals Junction size dependence of the heat controlled magnetic anisotropy in magnetic tunnel junctions

2021 ◽  
Vol 15 (1) ◽  
pp. 013001
Author(s):  
Minori Goto ◽  
Reika Kobayashi ◽  
Ryota Okuno ◽  
Tomohito Mizuno ◽  
Takekazu Yamane ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Heat Dissipation ◽  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Perpendicular Magnetic Anisotropy ◽  
Spin Torque ◽  
Heat Current ◽  
Current Voltage ◽  
Dissipation Model ◽  
Direct Current Voltage

Abstract We investigated the heat controlled magnetic anisotropy (HCMA) in magnetic tunnel junctions with various junction sizes. We evaluated the HCMA from perpendicular magnetic anisotropy under a direct current voltage measured by the spin-torque diode technique. The maximum HCMA magnitude of 5.4 μJ (Wm)−1 was observed, and the HCMA increased with increasing diameter. Our results can be explained by a simple heat dissipation model and suggest that the in-plane heat current affects HCMA.

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