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Increases in effective head field gradients in exchange spring media

Appl. Phys. Lett. 95, 172509 (2009); doi:10.1063/1.3257364

Published 29 October 2009

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Jehyun Lee,1 Dieter Suess,1 Thomas Schrefl,2,3 Julian Dean,2 and Josef Fidler1
1Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10, 1040 Vienna, Austria
2Department of Engineering Materials, University of Sheffield, Mappin Street, Sheffield S1 3JD, United Kingdom
3St. Pölten University of Applied Sciences, 3100 St. Pölten, Austria
Finite head field gradients in combination with switching field distribution of individual grains lead to transition jitter in granular recording media. We studied the effective head field gradients in various recording media structures using finite element micromagnetics. Inhomogeneous reversal was strongly induced in exchange spring structures that had a hard layer at the bottom. Due to the inhomogeneous reversal mode the effective head field gradient increases. As a result the transition jitter that is caused by an anisotropy distribution was reduced by more than 50% in exchange spring media compared to single phase media. ©2009 American Institute of Physics
History: Received 3 February 2009; accepted 8 October 2009; published 29 October 2009
Permalink: http://link.aip.org/link/?APPLAB/95/172509/1
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KEYWORDS and PACS

Keywords
PACS
  • 85.70.Kh
    Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.); domain-motion devices, etc
  • 75.30.Et
    Exchange and superexchange interactions in magnetically ordered materials
  • 75.30.Gw
    Magnetic anisotropy
  • 75.30.Kz
    Magnetic phase boundaries
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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REFERENCES (9)
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