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Journal of Applied Physics / Volume 107 / Issue 9 / PROCEEDINGS OF THE 11TH JOINT MMM-INTERMAG CONFERENCE, WASHINGTON, DC, 2010 / Magnetic Sensors, MEMS, Power, High-Frequency Devices

J. Appl. Phys. 107, 09E710 (2010); http://dx.doi.org/10.1063/1.3360768 (3 pages)

Reversibility and coercivity of Fe-alloy/Fe:SiO2 multilayers

Rui Zhang, Ralph Skomski, Xiaolu Yin, Sy-Hwang Liou, and D. J. Sellmyer

Physics and Astronomy, Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, Nebraska, 68588 USA

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(Received 30 October 2009; accepted 21 January 2010; published online 21 April 2010)

Soft bilayer alloys were produced by depositing granular Fe:SiO2 onto transition-metal thin films. We have prepared series of samples using different soft-magnetic materials including permalloy (Ni80Fe20), hcp Co90Fe10, and amorphous Co60Fe20B20, all covered by a layer of superparamagnetic Fe particles in a silicon-oxide matrix. The thickness of transition-metal layer was fixed and the magnetic properties of the bilayer system were studied by varying the Fe:SiO2 layers thicknesses from 0 to 70 nm. The bilayer yields a moderate improvement of the soft-magnetic performance. The hysteresis loops show a pronounced twofold anisotropy in the film plane for permalloy and amorphous CoFeB, which is consistent with the presence of external magnetic field during processing. This indicates that the coercivity is controlled by the pinning of 180° domain walls and that the effect of the Fe particles on the hysteresis is mediated by the interaction with the domain-wall stray fields.

© 2010 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL METHODS
  3. MAGNETIC PROPERTIES
  4. DISCUSSION AND CONCLUSIONS

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KEYWORDS and PACS

Keywords

boron alloys, cobalt alloys, coercive force, ferromagnetic materials, granular materials, iron, magnetic domain walls, magnetic hysteresis, magnetic multilayers, magnetic particles, magnetic thin films, Permalloy, silicon compounds, soft magnetic materials, superparamagnetism

PACS

  • 75.70.Cn

    Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

  • 75.20.-g

    Diamagnetism, paramagnetism, and superparamagnetism

  • 75.50.Tt

    Fine-particle systems; nanocrystalline materials

  • 75.60.Ch

    Domain walls and domain structure

  • 75.60.Ej

    Magnetization curves, hysteresis, Barkhausen and related effects

  • 75.70.Kw

    Domain structure (including magnetic bubbles and vortices)

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3360768

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (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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