Magnetic properties of Fe-based alloys

Journal Article · Mon May 01 04:00:00 EDT 2000 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.373372· OSTI ID:20216235

Schumann, F O ^[1]; Tobin, J G ^[1]

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1. Department of Chemistry and Material Science, Lawrence Livermore National Laboratory Livermore, California 94551 (United States)

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.

• OSTI ID: 20216235
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 9 Vol. 87; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ADVANCED LIGHT SOURCE
COBALT ALLOYS
DICHROISM
EXPERIMENTAL DATA
IRON BASE ALLOYS
MAGNETIZATION
NICKEL ALLOYS
PHOTOEMISSION