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Title: Magnetic properties of Fe-based alloys

Abstract

The magnetic properties of fcc Fe{sub x}Ni{sub 1-x} and Fe{sub x}Co{sub 1-x} alloys grown on Cu(100) were investigated in an element-specific fashion. The technique employed was linear dichroism in photoemission, which by varying the chirality can also determine the magnetization axis. We observed a different behavior for the two alloys at Fe concentrations above 60%. At this concentration the Fe{sub x}Ni{sub 1-x} alloy shows a strong reduction of the Fe dichroism associated with the invar instability. This is in contrast to the Fe{sub x}Co{sub 1-x} alloy, where the Fe dichroism stays essentially constant across the concentration. Despite these differences both systems show a change of the easy axis at roughly the same electron count. For small Fe concentrations the easy axis is in-plane along the [011] direction. This changes into the [001] direction at Fe{sub 63}Ni{sub 37}, which is at 0.7 excess electrons per atom when compared with Fe. This is different to the bulk, where a change occurs at Fe{sub 25}Ni{sub 75}. We find the easy axis change for Fe{sub x}Co{sub 1-x} to occur at 49% Fe. This would be equivalent to 0.5 excess electrons when compared with Fe. (c) 2000 American Institute of Physics.

Authors:
 [1];  [1]
  1. Department of Chemistry and Material Science, Lawrence Livermore National Laboratory Livermore, California 94551 (United States)
Publication Date:
OSTI Identifier:
20216235
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 87; Journal Issue: 9; Other Information: PBD: 1 May 2000; Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; IRON BASE ALLOYS; NICKEL ALLOYS; COBALT ALLOYS; PHOTOEMISSION; DICHROISM; ADVANCED LIGHT SOURCE; MAGNETIZATION; EXPERIMENTAL DATA

Citation Formats

Schumann, F. O., and Tobin, J. G. Magnetic properties of Fe-based alloys. United States: N. p., 2000. Web. doi:10.1063/1.373372.
Schumann, F. O., & Tobin, J. G. Magnetic properties of Fe-based alloys. United States. doi:10.1063/1.373372.
Schumann, F. O., and Tobin, J. G. Mon . "Magnetic properties of Fe-based alloys". United States. doi:10.1063/1.373372.
@article{osti_20216235,
title = {Magnetic properties of Fe-based alloys},
author = {Schumann, F. O. and Tobin, J. G.},
abstractNote = {The magnetic properties of fcc Fe{sub x}Ni{sub 1-x} and Fe{sub x}Co{sub 1-x} alloys grown on Cu(100) were investigated in an element-specific fashion. The technique employed was linear dichroism in photoemission, which by varying the chirality can also determine the magnetization axis. We observed a different behavior for the two alloys at Fe concentrations above 60%. At this concentration the Fe{sub x}Ni{sub 1-x} alloy shows a strong reduction of the Fe dichroism associated with the invar instability. This is in contrast to the Fe{sub x}Co{sub 1-x} alloy, where the Fe dichroism stays essentially constant across the concentration. Despite these differences both systems show a change of the easy axis at roughly the same electron count. For small Fe concentrations the easy axis is in-plane along the [011] direction. This changes into the [001] direction at Fe{sub 63}Ni{sub 37}, which is at 0.7 excess electrons per atom when compared with Fe. This is different to the bulk, where a change occurs at Fe{sub 25}Ni{sub 75}. We find the easy axis change for Fe{sub x}Co{sub 1-x} to occur at 49% Fe. This would be equivalent to 0.5 excess electrons when compared with Fe. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.373372},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 9,
volume = 87,
place = {United States},
year = {2000},
month = {5}
}