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Volume 9 Journalof Nanomedicine&Nanotechnology Asia Pacific Nano Congress 2018
August 10-11, 2018
August 10-11, 2018 Osaka, Japan
2nd World Congress on
Nanoscience and Nanotechnology
Hao Yu, J Nanomed Nanotechnol 2018, Volume 9
DOI: 10.4172/2157-7439-C6-082
Dynamic magnetization of single domain nanomagnet
Hao Yu
Xi’an Jiaotong-Liverpool University, China
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.
Recent Publications
1. Yongping Liu, Dongchang Wu, Fenfen Wei, Tao Kong, Hao Yu, Jinping Zhang and Guosheng
Cheng (2012) Potassium element modulation of optical and electrical properties of the quasi-
one-dimensional KxBi1-xFeO3-y system. CrystEngComm; 14: 7189-7194.
2. X W Dong, Y J Wu, J G Wan, T Wei, Z H Zhang, S Chen, H Yu and J M Liu (2008) Phase
shift of electric-field-induced magnetization in magnetoelectric laminate composite. Journal
of Physics D: Applied Physics; 41(3): 035003.
Biography
Hao Yu is an Associate Professor at Xi’an Jiaotong-Liverpool University. He has received his
PhD degree in Condensed Matter Physics from Nanjing University in 2007. He had worked for
Suzhou Institute of Nano-Tech and Nano-Bionics of Chinese Academy of Sciences from 2007
to 2009. He had joined Xi’an Jiaotong-Liverpool University in February 2010. His research
interests include spintronics and complex network.
Figure-1: Phase transition
of hysteresis due to γ and α.
Figure-2: Hysteresis evolution in terms of
frequency (f) and field (H).