Room-temperature perpendicular magnetic anisotropy of MgO/Fe/MgO ultrathin films

We used the anomalous Hall effect to study the magnetic properties of MgO/Fe(t)/MgO(001) structures in which the Fe thickness t ranged from 4 Å to 14 Å. For the iron deposited at 140 K, we obtained perpendicular magnetization at room temperature below the critical thickness of tc = (9 ± 1) Å. In the...

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Bibliographic Details
Published in:Journal of applied physics 2013-12, Vol.114 (22)
Main Authors: Kozioł-Rachwał, A., Skowroński, W., Ślęzak, T., Wilgocka-Ślęzak, D., Przewoźnik, J., Stobiecki, T., Qin, Q. H., van Dijken, S., Korecki, J.
Format: Article
Language:English
Subjects:
ANISOTROPY
Applied physics
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
HALL EFFECT
IRON
Magnesium oxide
MAGNESIUM OXIDES
Magnetic anisotropy
MAGNETIC PROPERTIES
Magnetism
MAGNETIZATION
ORIENTATION
Room temperature
SPIN
SWITCHES
TEMPERATURE DEPENDENCE
THICKNESS
THIN FILMS
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Summary:We used the anomalous Hall effect to study the magnetic properties of MgO/Fe(t)/MgO(001) structures in which the Fe thickness t ranged from 4 Å to 14 Å. For the iron deposited at 140 K, we obtained perpendicular magnetization at room temperature below the critical thickness of tc = (9 ± 1) Å. In the vicinity of tc, the easy magnetization axis switched from an out-of-plane orientation to an in-plane orientation, and the observed spin-reorientation transition was considered in terms of the competition among different anisotropies. The perpendicular magnetization direction was attributed to magnetoelastic anisotropy. Finally, the temperature-dependent spin-reorientation transition was analyzed for Fe thicknesses close to tc.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4843675