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Journal of Applied Physics / Volume 101 / Issue 1 / MAGNETISM AND SUPERCONDUCTIVITY

J. Appl. Phys. 101, 013905 (2007); http://dx.doi.org/10.1063/1.2403972 (7 pages)

Magnetic and magnetoresistive properties of NiFe/Au/Co/Au multilayers with perpendicular anisotropy of Co layers

M. Urbaniak1, F. Stobiecki1, B. Szymański1, A. Ehresmann2, A. Maziewski3, and M. Tekielak3

1Institute of Molecular Physics, Polish Academy of Sciences, ul. Smoluchowskiego 17, 60-179 Poznań, Poland
2Department of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Str. 40, D-34132 Kassel, Germany
3Laboratory of Magnetism, Institute of Experimental Physics, University of Białystok, ul. Lipowa 41, 15-950 Białystok, Poland

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(Received 29 May 2006; accepted 21 October 2006; published online 9 January 2007)

The giant magnetoresistance (GMR), magnetization reversal, and domain structure of magnetron sputtered spin valve [NiFe/Au/Co/Au]N multilayers consisting of ferromagnetic layers with alternating in-plane (NiFe) and out-of-plane (Co) magnetic anisotropy has been investigated. For 0.4<tCo<1.2 nm GMR dependencies characterized by a linear and almost nonhysteretic dependence of resistance on the magnetic field were found. Within the hysteretic range of the magnetization reversal of the Co layers, for N>3, the neighboring magnetic layers were observed to be coupled. This coupling is of magnetostatic origin. The effective coupling field, estimated from GMR dependencies, is of the order of 100 kA/m. Micromagnetic simulations confirm that the domain structure of Co layers influences the behavior of NiFe layers.

© 2007 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENT
  3. RESULTS AND DISCUSSION
    1. Magnetic properties of NiFe/Au/Co/Au layered films
    2. Magnetotransport
      1. Correlation between M(H) and R(H) dependencies
      2. The influence of number of repetitions on magnetoresistance
    3. Magnetostatic coupling
  4. CONCLUSIONS

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KEYWORDS and PACS

Keywords

nickel alloys, iron alloys, gold, cobalt, ferromagnetic materials, magnetic multilayers, perpendicular magnetic anisotropy, magnetic hysteresis, giant magnetoresistance, magnetisation reversal, spin valves, sputter deposition, micromagnetics

PACS

  • 75.30.Gw

    Magnetic anisotropy

  • 75.50.Bb

    Fe and its alloys

  • 75.50.Cc

    Other ferromagnetic metals and alloys

  • 75.70.Cn

    Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

  • 75.60.Ej

    Magnetization curves, hysteresis, Barkhausen and related effects

  • 75.47.De

    Giant magnetoresistance

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2403972

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

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

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