Temperature dependence of perpendicular magnetic anisotropy in CoFeB thin films

Temperature dependence of perpendicular magnetic anisotropy in CoFeB thin films

We study perpendicular magnetic anisotropy in thin films of Ta/Co20Fe60B20/MgO by ferromagnetic resonance and find a linear temperature dependence for the first and second order uniaxial terms from 5 to 300 K. Our data suggest the possible hybridization of Fe-O orbitals at the CoFeB/MgO interface fo...

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Veröffentlicht in:Applied physics letters 2016-04, Vol.108 (14)
Hauptverfasser: Fu, Yu, Barsukov, I., Li, Jing, Gonçalves, A. M., Kuo, C. C., Farle, M., Krivorotov, I. N.
Format: Artikel
Sprache:eng
Schlagworte:
ANISOTROPY
Applied physics
CARBON DIOXIDE
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Ferromagnetic materials
FERROMAGNETIC RESONANCE
INTERFACES
Magnesium oxide
MAGNESIUM OXIDES
Magnetic anisotropy
SPIN
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
THICKNESS
THIN FILMS
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Zusammenfassung:We study perpendicular magnetic anisotropy in thin films of Ta/Co20Fe60B20/MgO by ferromagnetic resonance and find a linear temperature dependence for the first and second order uniaxial terms from 5 to 300 K. Our data suggest the possible hybridization of Fe-O orbitals at the CoFeB/MgO interface for the origin of the first order anisotropy. However, we also find that non-interfacial contributions to the anisotropy are present. An easy-cone anisotropy is found for the entire temperature range in the narrow region of film thicknesses around the spin reorientation transition 1.2–1.35 nm.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4945682