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Structural and magnetic characterization of ion-beam deposited NiFe/NixFe1-xO composite films

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3 Author(s)
Lin, K.W. ; Department of Materials Science and Engineering, State University of New York at Stony Brook, Stony Brook, New York 11794 ; Gambino, R.J. ; Lewis, L.H.

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Nanocomposite films of Ni80Fe20/NixFe1-xO were prepared by a dual ion-beam deposition technique. The structural and magnetic properties of nanocomposite films fabricated with oxygen content in the deposition assist beam ranging from 0% to 55% were studied. The dependence of the resistivity on oxygen percent shows that the compositions with exchange-enhanced coercivity are close to a percolation threshold. A strong temperature dependence of coercivity Hc and exchange bias field Hex is found in these composite films. Films prepared with 46% O2 in the assist beam exhibit an enhanced Hc relative to Permalloy (Ni80Fe20) and a characteristic shifted hysteresis loop indicative of exchange coupling between the constituent metal and oxide phases. At T=10 K, films prepared with 44% O2 in the assist beam have an exchange shift Hex∼-225 Oe with a blocking temperature TB∼100 K that reflects the low Néel temperatures of FeO-rich NixFe1-xO solid solutions. © 2003 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:93 ,  Issue: 10 )