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Symmetry 2010, 2(2), 999-1021; doi:10.3390/sym2020999

Magnetization Dynamics Symmetry in Spin Torque Induced Magnetization Switching

Seagate Technology, 7801 Computer Avenue South, Bloomington, MN 55435, USA
Received: 27 December 2009 / Revised: 28 April 2010 / Accepted: 30 April 2010 / Published: 7 May 2010
(This article belongs to the Special Issue Feature Papers: Symmetry Concepts and Applications)
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Magnetization dynamics symmetry plays important roles in magnetization switching. Here we study magnetic field and spin torque induced magnetization switching. Spin moment transferring from polarized itinerant electrons to local magnetization provides a magnetization switching mechanism without using external magnetic field. Besides its importance in fundamental magnetization switching dynamics, spin torque magnetization switching has great application potential for future nanoscale magnetoelectronic devices. The paper explores magnetization dynamics symmetry effects on spin torque induced magnetization switching, and its interactions with random fluctuations. We will illustrate the consequences of magnetization dynamics symmetry on the critical switching current magnitude and the thermal stability energy of spin torque induced magnetization switching, which are the two most important design criteria for nanoscale spin torque magnetic devices. The concept of Logarithmic magnetization susceptibility is used to extract symmetry and damping information on spin torque induced nonlinear magnetization dynamic processes, and provides paths to control spin torque induced switching in a fluctuating environment.
Keywords: symmetry; magnetization dynamics; spin torque switching; random fluctuations symmetry; magnetization dynamics; spin torque switching; random fluctuations
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Wang, X. Magnetization Dynamics Symmetry in Spin Torque Induced Magnetization Switching. Symmetry 2010, 2, 999-1021.

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