Magnetic Anisotropy Dispersion in FeCo Films

We report on our study of magnetic and nonmagnetic parameters such as coercivity, anisotropy , magnetic dispersion, and stress on FeCo films of various thicknesses from 25 A to 500 A . We used 10 A Ru or NiFe seed layers for two sets of FeCo films. All films showed so-called hard-axis coercivity roc...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2008-04, Vol.44 (4), p.431-434
Main Authors: Mathieu, C., Inturi, V.R., Hadley, M.J.
Format: Article
Language:English
Subjects:
Anisotropic magnetoresistance
Coercive force
Coercivity
Cross-disciplinary physics: materials science
rheology
Dispersions
Exact sciences and technology
Iron compounds
Magnetic anisotropy
Magnetic films
magnetic hysteresis
Magnetic materials
Magnetic properties
magnetic recording
Magnetic separation
Magnetism
Materials science
measurement
Microscopy
Minima
Other topics in materials science
Perpendicular magnetic anisotropy
Physics
Seeds
Stress
Stresses
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Summary:We report on our study of magnetic and nonmagnetic parameters such as coercivity, anisotropy , magnetic dispersion, and stress on FeCo films of various thicknesses from 25 A to 500 A . We used 10 A Ru or NiFe seed layers for two sets of FeCo films. All films showed so-called hard-axis coercivity rocking, i.e., the hard-axis coercivity exhibits two local minima close to the nominal hard axis. Magnetic properties and stress change dramatically with FeCo thickness, but with little difference between the two types of seed materials. We found a correlation between the angular separation of the two local coercivity minima and easy-axis coercivity. The results stress the need to differentiate between two levels of dispersion, one at the microscopic and the other at the macroscopic level.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2008.917265