A systematic investigation of the dependences of the exchange bias and the ferromagnetic resonance frequency on the pore size of the antidot arrays fabricated by depositing Permalloy-FeMn multilayer thin films onto self-organized porous anodic aluminum oxide membranes was carried out. The magnetic and microwave properties of the antidot arrays with different pore sizes ranging from 30 to 80 nm are characterized and compared with that of the continuous thin films. It was found that the exchange bias field and the ferromagnetic resonance frequency are increased with the increase of the pore size, which may tentatively be interpreted in the framework of the random field model. It was also found that by using the antidot arrays in the best condition (the FeNi thickness is 20 nm and the pore size is 80 nm), one can enhance the exchange bias field from 65 to 135 Oe and the ferromagnetic resonance frequency from 3.1 to 4.1 GHz accordingly.
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1 November 2008
Research Article|
November 06 2008
Enhancement of exchange bias and ferromagnetic resonance frequency by using multilayer antidot arrays
Nguyen N. Phuoc;
Department of Physics, Center for Superconducting and Magnetic Materials,
National University of Singapore
, 2 Science Drive 3, Singapore 117542, Singapore
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S. L. Lim;
S. L. Lim
Department of Physics, Center for Superconducting and Magnetic Materials,
National University of Singapore
, 2 Science Drive 3, Singapore 117542, Singapore
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F. Xu;
F. Xu
Department of Physics, Center for Superconducting and Magnetic Materials,
National University of Singapore
, 2 Science Drive 3, Singapore 117542, Singapore
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Y. G. Ma;
Y. G. Ma
Department of Physics, Center for Superconducting and Magnetic Materials,
National University of Singapore
, 2 Science Drive 3, Singapore 117542, Singapore
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C. K. Ong
C. K. Ong
Department of Physics, Center for Superconducting and Magnetic Materials,
National University of Singapore
, 2 Science Drive 3, Singapore 117542, Singapore
Search for other works by this author on:
Nguyen N. Phuoc
S. L. Lim
F. Xu
Y. G. Ma
C. K. Ong
Department of Physics, Center for Superconducting and Magnetic Materials,
National University of Singapore
, 2 Science Drive 3, Singapore 117542, Singapore
a)
Author to whom correspondence should be addressed. Tel.: 65-65162816. FAX: 65-67776126. Electronic mail: [email protected].
J. Appl. Phys. 104, 093708 (2008)
Article history
Received:
July 16 2008
Accepted:
September 16 2008
Citation
Nguyen N. Phuoc, S. L. Lim, F. Xu, Y. G. Ma, C. K. Ong; Enhancement of exchange bias and ferromagnetic resonance frequency by using multilayer antidot arrays. J. Appl. Phys. 1 November 2008; 104 (9): 093708. https://doi.org/10.1063/1.3009968
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