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Applied Physics Letters / Volume 96 / Issue 26 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 96, 262502 (2010); http://dx.doi.org/10.1063/1.3457907 (3 pages)

Tuning of magnetism in ferromagnetic thin films by reversing the functional groups of molecular underlayer

Jung-Chi Tai1, Jang-Chang Huang1, Yin-Ming Chang1, Kai-Shin Li1, Jhen-Yong Hong1, Sheng-Syun Wong1, Wen-Chung Chiang2, and Minn-Tsong Lin1,3

1Department of Physics, National Taiwan University, 10617 Taipei, Taiwan
2Department of Physics, Chinese Culture University, 11114 Taipei, Taiwan
3Institute of Atomic and Molecular Sciences, Academia Sinica, 10617 Taipei, Taiwan

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(Received 13 April 2010; accepted 2 June 2010; published online 28 June 2010)

We demonstrate a molecular approach of tuning the magnetic properties of ferromagnetic (FM) thin films by reversing the functional groups of the organic underlayer. For the CoFe/Langmuir–Blodgett (LB) film system, we find that the coercivity of CoFe thin films (from 4 to 10 nm) made on hydrophobic surfaces is significantly enhanced whereas that on hydrophilic surfaces remains unchanged, as compared with the films directly on glass substrates. These findings suggest an alternative way for tuning the magnetic properties of the FM layer by LB film in which the functional groups play an important role.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

cobalt alloys, coercive force, ferromagnetic materials, hydrophobicity, iron alloys, Langmuir-Blodgett films, magnetic thin films, tuning

PACS

  • 75.70.-i

    Magnetic properties of thin films, surfaces, and interfaces

  • 75.60.Ej

    Magnetization curves, hysteresis, Barkhausen and related effects

  • 68.47.Pe

    Langmuir-Blodgett films on solids; polymers on surfaces; biological molecules on surfaces

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3457907

PUBLICATION DATA

ISSN

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

Publisher

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

For access to fully linked references, you need to log in.
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