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Title: Surface oxidation of Permalloy thin films

Abstract

The chemical and magnetic structures of oxides on the surface of Permalloy Ni{sub 81}Fe{sub 19} films were investigated as functions of annealing time with x-ray and polarized neutron reflectometry. For annealing times of less than one hour, the oxide consisted of a 1.5-nm-thick layer of NiO on an Fe oxide layer that was in contact with Permalloy. The Fe oxide thickness increases with annealing time with a parabolic rate constant of 10{sup -18} cm{sup 2} s{sup -1} (for an annealing temperature of 373 K). The growth of the oxide layer is limited by the rate at which oxygen appears below the NiO layer. No portion of the oxide region was found to be ferromagnetically ordered for films annealed less than one hour. The growth of the Fe oxide region is well correlated with the measured increase of the second-order magnetic susceptibility for similarly prepared samples.

Authors:
;  [1];  [2]
  1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
  2. National Institute of Standards and Technology, Boulder, Colorado 80303 (United States)
Publication Date:
OSTI Identifier:
20787820
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 73; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevB.73.014420; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANNEALING; FERROMAGNETIC MATERIALS; LAYERS; MAGNETIC SUSCEPTIBILITY; NEUTRON DIFFRACTION; NEUTRONS; NICKEL OXIDES; OXIDATION; OXYGEN; PERMALLOY; REFLECTION; SURFACES; THIN FILMS; X RADIATION

Citation Formats

Fitzsimmons, M. R., Crawford, T. M., and Silva, T. J. Surface oxidation of Permalloy thin films. United States: N. p., 2006. Web. doi:10.1103/PHYSREVB.73.0.
Fitzsimmons, M. R., Crawford, T. M., & Silva, T. J. Surface oxidation of Permalloy thin films. United States. doi:10.1103/PHYSREVB.73.0.
Fitzsimmons, M. R., Crawford, T. M., and Silva, T. J. Sun . "Surface oxidation of Permalloy thin films". United States. doi:10.1103/PHYSREVB.73.0.
@article{osti_20787820,
title = {Surface oxidation of Permalloy thin films},
author = {Fitzsimmons, M. R. and Crawford, T. M. and Silva, T. J.},
abstractNote = {The chemical and magnetic structures of oxides on the surface of Permalloy Ni{sub 81}Fe{sub 19} films were investigated as functions of annealing time with x-ray and polarized neutron reflectometry. For annealing times of less than one hour, the oxide consisted of a 1.5-nm-thick layer of NiO on an Fe oxide layer that was in contact with Permalloy. The Fe oxide thickness increases with annealing time with a parabolic rate constant of 10{sup -18} cm{sup 2} s{sup -1} (for an annealing temperature of 373 K). The growth of the oxide layer is limited by the rate at which oxygen appears below the NiO layer. No portion of the oxide region was found to be ferromagnetically ordered for films annealed less than one hour. The growth of the Fe oxide region is well correlated with the measured increase of the second-order magnetic susceptibility for similarly prepared samples.},
doi = {10.1103/PHYSREVB.73.0},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 1,
volume = 73,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}