Dr. Hao Yu
Xi’an Jiaotong-Liverpool University, China
Title: Dynamic magnetization of single domain nanomagnet
Biography
Biography: Dr. Hao Yu
Abstract
The dynamic magnetization of nanomagnets is significant to spintronic devices in terms of high speed and high density storage technology or logic applications. The dynamics of the macrospin model of a single-domain nanomagnet is investigated in both analytical and numerical methods based on the Landau-Lifshitz-Gilbert equation which is a nonlinear differential equation describing the evolution of magnetization vector. The dynamic hysteresis, namely the magnetic switching under high frequency magnetic field with/without spin transfer torque is analyzed in terms of the evolution of the geometry of loop. The shape of static hysteresis loop is determined by the parameter of damping, meanwhile the shape evolution of dynamic hysteresis loop is dependent on the magnitude of field and frequency. Frequency-dependent response with resonant peak has been found in the dispersion curve. The phase diagram is obtained to be able to have a clear picture of the dynamic magnetization of nanomagnets driven by periodic field or current.
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