scholarly journals Reversal process of a magnetic vortex core under the combined action of a perpendicular field and spin transfer torque

2013 ◽  
Vol 102 (6) ◽  
pp. 062401 ◽  
Author(s):  
N. Locatelli ◽  
A. E. Ekomasov ◽  
A. V. Khvalkovskiy ◽  
Sh. A. Azamatov ◽  
K. A. Zvezdin ◽  
...  
Keyword(s):  
Vortex Core ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Magnetic Vortex ◽  
Reversal Process ◽  
Combined Action ◽  
Perpendicular Field

scholarly journals Current-induced spin–orbit torques

2011 ◽  
Vol 369 (1948) ◽  
pp. 3175-3197 ◽  
Author(s):  
Pietro Gambardella ◽  
Ioan Mihai Miron
Keyword(s):  
Angular Momentum ◽  
Exchange Coupling ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Spin Torque ◽  
Inversion Symmetry ◽  
Spin Orbit ◽  
Great Flexibility ◽  
Combined Action ◽  
Proper Material

The ability to reverse the magnetization of nanomagnets by current injection has attracted increased attention ever since the spin-transfer torque mechanism was predicted in 1996. In this paper, we review the basic theoretical and experimental arguments supporting a novel current-induced spin torque mechanism taking place in ferromagnetic (FM) materials. This effect, hereafter named spin–orbit (SO) torque, is produced by the flow of an electric current in a crystalline structure lacking inversion symmetry, which transfers orbital angular momentum from the lattice to the spin system owing to the combined action of SO and exchange coupling. SO torques are found to be prominent in both FM metal and semiconducting systems, allowing for great flexibility in adjusting their orientation and magnitude by proper material engineering. Further directions of research in this field are briefly outlined.

Magnetic vortex dynamics induced by spin-transfer torque

2007 ◽  
Vol 310 (2) ◽  
pp. 2041-2042 ◽  
Author(s):  
J. Shibata ◽  
Y. Nakatani ◽  
G. Tatara ◽  
H. Kohno ◽  
Y. Otani
Keyword(s):  
Vortex Dynamics ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Magnetic Vortex

scholarly journals Off-centred immobile magnetic vortex under influence of spin-transfer torque

2011 ◽  
Vol 44 (28) ◽  
pp. 285001 ◽  
Author(s):  
Volodymyr P Kravchuk ◽  
Denis D Sheka ◽  
Franz G Mertens ◽  
Yuri Gaididei
Keyword(s):  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Magnetic Vortex

scholarly journals Spin transfer driven resonant expulsion of a magnetic vortex core for efficient rf detector

AIP Advances ◽  
2016 ◽  
Vol 7 (5) ◽  
pp. 056608 ◽  
Author(s):  
S. Menshawy ◽  
A. S. Jenkins ◽  
K. J. Merazzo ◽  
L. Vila ◽  
R. Ferreira ◽  
...  
Keyword(s):  
Vortex Core ◽  
Spin Transfer ◽  
Magnetic Vortex ◽  
Rf Detector

Nonadiabatic spin-transfer torque of magnetic vortex structures in a permalloy square

2014 ◽  
Vol 89 (17) ◽  
Author(s):  
Stefan Rößler ◽  
Sebastian Hankemeier ◽  
Benjamin Krüger ◽  
Felix Balhorn ◽  
Robert Frömter ◽  
...  
Keyword(s):  
Vortex Structures ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Magnetic Vortex

Spin-transfer torque in nonuniform magnetic structures

2017 ◽  
Author(s):  
T. Ono
Keyword(s):  
Magnetic Moments ◽  
Magnetic Domain ◽  
Dipole Interaction ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Magnetic Vortex ◽  
Magnetic Domains ◽  
Spin Configuration ◽  
Magnetic Structures ◽  
Ferromagnetic Disk

This chapter defines a magnetic domain wall (DW) as the transition region where the direction of magnetic moments gradually change between two neighbouring domains. It has been pointed out that ferromagnetic materials are not necessarily magnetized to saturation in the absence of an external magnetic field. Instead, they have magnetic domains, within each of which magnetic moments align. The formation of the magnetic domains is energetically favourable because this structure can lower the magnetostatic energy originating from the dipole–dipole interaction. A magnetic vortex realized in a ferromagnetic disk is a typical example of nonuniform magnetic structure. In very small ferromagnetic systems, where a curling spin configuration has been proposed to occur in place of domains, the formation of DWs is not energetically favored.

scholarly journals Current-induced magnetic vortex motion by spin-transfer torque

2006 ◽  
Vol 73 (2) ◽  
Author(s):  
Junya Shibata ◽  
Yoshinobu Nakatani ◽  
Gen Tatara ◽  
Hiroshi Kohno ◽  
Yoshichika Otani
Keyword(s):  
Vortex Motion ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Magnetic Vortex

Nanocavity-Mediated Fast Magnetic Vortex Core In-Situ Switching by Local Magnetic Field

2021 ◽  
Vol 38 (12) ◽  
pp. 127501
Author(s):  
Xiao-Ping Ma ◽  
Hongguo Yang ◽  
Changfeng Li ◽  
Cheng Song ◽  
Hong-Guang Piao
Keyword(s):  
Magnetic Field ◽  
Vortex Core ◽  
Switching Time ◽  
Magnetic Vortex ◽  
Local Magnetic Field ◽  
Fast Switching ◽  
Low Field ◽  
Perpendicular Field ◽  
Data Reading

Fast in situ switching of magnetic vortex core in a ferromagnetic nanodisk assisted by a nanocavity, with diameter comparable to the dimension of a vortex core, is systematically investigated by changing the strength as well as the diameter of the effective circular region of the applied magnetic field. By applying a local magnetic field within a small area at the nanodisk center, fast switching time of about 35 ps is achieved with relatively low field strength (70 mT) which is beneficial for fast data reading and writing. The reason for this phenomenon is that the magnetic spins around the nanocavity is aligned along the cavity wall due to the shape anisotropy when the perpendicular field is applied, which deepens the dip around the vortex core, and thus facilitates the vortex core switching.

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