Origin of anomalous hysteresis loops induced by femtosecond laser pulses in GdFeCo amorphous films

被引：20

作者：

Xu, Chudong ^{[1
,3
]}

Chen, Zhifeng ^{[1
]}

Chen, Daxin ^{[1
]}

Zhou, Shiming ^{[2
]}

Lai, Tianshu ^{[1
]}

机构：

[1] Sun Yat Sen Univ, Sch Phys & Engn, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Guangdong, Peoples R China

[2] Fudan Univ, Dept Phys, State Key Lab Adv Photon Mat & Devices, Shanghai 200433, Peoples R China

[3] S China Agr Univ, Coll Sci, Guangzhou 510642, Guangdong, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 09期

关键词：

amorphous state; cobalt alloys; coercive force; ferrimagnetic materials; gadolinium alloys; iron alloys; Kerr magneto-optical effect; magnetic hysteresis; magnetisation reversal;

D O I：

10.1063/1.3339878

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A controllable pump-pulse-number magneto-optical Kerr technique combined with an initializing field scanning approach is developed to eliminate and identify memory and accumulation effects, respectively, from external field history and multiple pulse excitations. A series of anomalous loops of GdFeCo films are measured for different amount of pump pulses using this technique, revealing that serious memory and accumulation effects exist in continuous-pulse-pumped anomalous hysteresis loops which show illusory information of hot coercivity and degree of magnetization reversal. Single-pulse-induced anomalous loop reveals that the hot coercivity shown by continuous-pulse-pumped anomalous loops is not the minimum external field that drives real magneto-optical recording.

引用

页数：3

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