Micromagnetic Simulation on Effect of Ampere Field and External Field on Dynamics of Spin Transfer Torque Switching

2006 ◽  
Author(s):  
K. Ito ◽  
T. Devolder ◽  
C. Chappert ◽  
M. J. Carey ◽  
J. A. Katine
Keyword(s):  
External Field ◽  
Spin Transfer Torque ◽  
Micromagnetic Simulation ◽  
Spin Transfer

Micromagnetic simulation on effect of oersted field and hard axis field in spin transfer torque switching

2007 ◽  
Vol 40 (5) ◽  
pp. 1261-1267 ◽  
Author(s):  
K Ito ◽  
T Devolder ◽  
C Chappert ◽  
M J Carey ◽  
J A Katine
Keyword(s):  
Spin Transfer Torque ◽  
Micromagnetic Simulation ◽  
Spin Transfer ◽  
Hard Axis

scholarly journals Micromagnetic Simulation of Spin Transfer Torque Magnetization Precession Phase Diagram in a Spin-Valve Nanopillar under External Magnetic Fields

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
H. B. Huang ◽  
X. Q. Ma ◽  
Z. H. Liu ◽  
X. M. Shi ◽  
T. Yue ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Magnetic Fields ◽  
Dynamic Balance ◽  
Spin Valve ◽  
Spin Transfer Torque ◽  
Micromagnetic Simulation ◽  
Spin Transfer ◽  
Magnetization Distribution ◽  
Magnetization Precession ◽  
Evolution Behavior

We investigated spin transfer torque magnetization precession in a nanoscale pillar spin-valve under external magnetic fields using micromagnetic simulation. The phase diagram of the magnetization precession is calculated and categorized into four states according to their characteristics. Of the four states, the precessional state has two different modes: steady precession mode and substeady precession mode. The different modes originate from the dynamic balance between the spin transfer torque and the Gilbert damping torque. Furthermore, we reported the behavior of the temporal evolutions of magnetization components in steady precession mode at the condition of the applied magnetic field using the orbit projection method and explaining perfectly the magnetization components evolution behavior. In addition, a result of a nonuniform magnetization distribution is observed in the free layer due to the excitation of non-uniform mode.

Strong high-frequency spin waves released periodically from a confined region

2020 ◽  
Vol 91 (3) ◽  
pp. 30601
Author(s):  
Zhen-Wei Zhou ◽  
Xi-Guang Wang ◽  
Yao-Ghuang Nie ◽  
Qing-Lin Xia ◽  
Guang-Hua Guo
Keyword(s):  
Relaxation Time ◽  
Spin Wave ◽  
High Frequency ◽  
Microwave Field ◽  
Spin Waves ◽  
Spin Transfer Torque ◽  
Micromagnetic Simulation ◽  
Spin Transfer ◽  
Limited Region ◽  
Strong Spin

Efficient excitation of spin waves is a key issue in magnonics. Here, by using micromagnetic simulation and analytical analysis, we study the excitation of spin waves confined in a limited region by a microwave field with assistance of spin-transfer torque. The results show that the spin-transfer torque can decrease the effective damping constant and increase the spin wave relaxation time substantially. As a result, the amplitude of the excited spin waves is increased greatly. By periodically lifting and establishing the blocking areas, strong spin-wave pulses are released from the confined region. Such generated spin-wave pulses are much stronger than traditionally excited spin waves, especially for high-frequency spin waves. Our study provides a new method to generate strong high-frequency spin waves.

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