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Title: Magnetic coupling in Co/face-centered-cubic Fe/Co sandwiches

Abstract

Ferromagnetic (FC) and antiferromagnetic coupling (AFC) of Co layers across a metastable fcc Fe spacer layer has been observed. Room-temperature-grown Fe on Co/Cu(100) was chosen as a spacer layer because it exhibits three distinct structural and magnetic phases depending on the thickness range: fct and ferromagnetic (region I), fcc and nonferromagnetic (region II), bcc and ferromagnetic (region III) (listed in order of increasing thickness). Co/Fe/Co sandwiches were grown on Cu(100) by molecular beam epitaxy with a base pressure of {approximately}2{times}10{sup {minus}10} Torr, and characterized by low-energy electron diffraction and reflection high-energy electron diffraction. The magnetic properties were studied {ital in} {ital situ} using surface magneto-optic Kerr effect. Using a wedged Fe spacer layer, we investigated the magnetic coupling between Co films across many thicknesses of Fe. We found FC in region I, strong AFC at the boundary between regions I and II, and weak AFC in region II. We also studied the effect of just the Co overlayer on the metastable fcc Fe. We find that Co/Fe/Cu(100) differs qualitatively from Fe/Co/Cu(100). Finally, we find an oscillation in the AFC with a periodicity of {approximately}12 A by artificially increasing the thickness range of region II. {copyright} {ital 1996 American Institute ofmore » Physics.}« less

Authors:
; ;  [1]
  1. Department of Physics, University of California at Berkeley, Berkeley, California 94720 (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory
OSTI Identifier:
279985
Report Number(s):
CONF-951101-
Journal ID: JAPIAU; ISSN 0021-8979; TRN: 9608M0035
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 79; Journal Issue: 8; Conference: 40. conference on magnetism and magnetic materials, Philadelphia, PA (United States), 6-9 Nov 1995; Other Information: PBD: Apr 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COBALT; THIN FILMS; IRON; EXCHANGE INTERACTIONS; FCC LATTICES; MOLECULAR BEAM EPITAXY; MAGNETIC PROPERTIES; THICKNESS; INTERFACES; SANDWICH STRUCTURES

Citation Formats

Kawakami, R K, Escorcia-Aparicio, E J, Qiu, Z Q, and Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720. Magnetic coupling in Co/face-centered-cubic Fe/Co sandwiches. United States: N. p., 1996. Web. doi:10.1063/1.361714.
Kawakami, R K, Escorcia-Aparicio, E J, Qiu, Z Q, & Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720. Magnetic coupling in Co/face-centered-cubic Fe/Co sandwiches. United States. doi:10.1063/1.361714.
Kawakami, R K, Escorcia-Aparicio, E J, Qiu, Z Q, and Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720. Mon . "Magnetic coupling in Co/face-centered-cubic Fe/Co sandwiches". United States. doi:10.1063/1.361714.
@article{osti_279985,
title = {Magnetic coupling in Co/face-centered-cubic Fe/Co sandwiches},
author = {Kawakami, R K and Escorcia-Aparicio, E J and Qiu, Z Q and Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720},
abstractNote = {Ferromagnetic (FC) and antiferromagnetic coupling (AFC) of Co layers across a metastable fcc Fe spacer layer has been observed. Room-temperature-grown Fe on Co/Cu(100) was chosen as a spacer layer because it exhibits three distinct structural and magnetic phases depending on the thickness range: fct and ferromagnetic (region I), fcc and nonferromagnetic (region II), bcc and ferromagnetic (region III) (listed in order of increasing thickness). Co/Fe/Co sandwiches were grown on Cu(100) by molecular beam epitaxy with a base pressure of {approximately}2{times}10{sup {minus}10} Torr, and characterized by low-energy electron diffraction and reflection high-energy electron diffraction. The magnetic properties were studied {ital in} {ital situ} using surface magneto-optic Kerr effect. Using a wedged Fe spacer layer, we investigated the magnetic coupling between Co films across many thicknesses of Fe. We found FC in region I, strong AFC at the boundary between regions I and II, and weak AFC in region II. We also studied the effect of just the Co overlayer on the metastable fcc Fe. We find that Co/Fe/Cu(100) differs qualitatively from Fe/Co/Cu(100). Finally, we find an oscillation in the AFC with a periodicity of {approximately}12 A by artificially increasing the thickness range of region II. {copyright} {ital 1996 American Institute of Physics.}},
doi = {10.1063/1.361714},
journal = {Journal of Applied Physics},
number = 8,
volume = 79,
place = {United States},
year = {1996},
month = {4}
}