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Applied Physics Letters / Volume 96 / Issue 9 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 96, 092514 (2010); http://dx.doi.org/10.1063/1.3339878 (3 pages)

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

Chudong Xu1,2, Zhifeng Chen1, Daxin Chen1, Shiming Zhou3, and Tianshu Lai1

1State-Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou, Guangdong 510275, People’s Republic of China
2College of Science, South China Agricultural University, Guangzhou, Guangdong 510642, People’s Republic of China
3Department of Physics, State Key Laboratory for Advanced Photonic Materials and Devices, Fudan University, Shanghai 200433, People’s Republic of China

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(Received 1 November 2009; accepted 6 February 2010; published online 5 March 2010)

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.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

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

PACS

  • 78.20.Ls

    Magneto-optical effects

  • 75.60.Ej

    Magnetization curves, hysteresis, Barkhausen and related effects

  • 75.50.Vv

    High coercivity materials

  • 75.60.Jk

    Magnetization reversal mechanisms

  • 75.50.Gg

    Ferrimagnetics

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3339878

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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