Dynamics and scaling of low-frequency hysteresis loops in nanomagnets

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	Dynamics and scaling of low-frequency hysteresis loops in nanomagnets
	Z. H. Zhu; Y. J. Sun; Q. Zhang; J. M. Liu
	2007
发表期刊	Physical Review B
ISSN	1098-0121
卷号	76 期号:1
摘要	The magnetic hysteresis and its area for two-dimensional nanomagnets with precessional magnetization reversal, driven by ac magnetic field of frequency f and amplitude H-0, are investigated by numerically solving the Landau-Lifshitz-Gilbert equation. Irregular hysteresis loops are observed when f is low and H-0 is high, indicating the significant contribution of nonadiabatic precession to the magnetization reversal. The frequency dispersion of hysteresis area A(f) shows the double-peaked pattern with the low-f peak caused by the precessional magnetization reversal and the high-f peak originating from the quasichaotic oscillations of the spin precession. The power-law scaling behavior of the hysteresis dispersion, i.e., A proportional to H(0)(lambda)f(beta) with exponents lambda=0.60 and beta=0.50, is observed in the low-f range limit. We present the one-parameter dynamic scaling on the low-f hysteresis dispersions over a broad range of H-0, demonstrating the scalability of the hysteresis dispersion and thus the existence of the unique characteristic time for magnetization reversal process in nanomagnets, given the field amplitude H-0.
部门归属	nanjing univ, lab solid state microstruct, nanjing 210093, peoples r china. chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china.;liu, jm (reprint author), nanjing univ, lab solid state microstruct, nanjing 210093, peoples r china
关键词	Precessional Magnetization Reversal Self-organized Criticality Model Spin Systems Films Field
URL	查看原文
WOS记录号	WOS:000248487900096
引用统计	被引频次：22[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/34116
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. H. Zhu,Y. J. Sun,Q. Zhang,et al. Dynamics and scaling of low-frequency hysteresis loops in nanomagnets[J]. Physical Review B,2007,76(1).
APA	Z. H. Zhu,Y. J. Sun,Q. Zhang,&J. M. Liu.(2007).Dynamics and scaling of low-frequency hysteresis loops in nanomagnets.Physical Review B,76(1).
MLA	Z. H. Zhu,et al."Dynamics and scaling of low-frequency hysteresis loops in nanomagnets".Physical Review B 76.1(2007).