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Strain Mediated in‐Plane Uniaxial Magnetic Anisotropy in Amorphous CoFeB Films Based on Structural Phase Transitions of BaTiO 3 Single‐Crystal Substrates
Author(s) -
Isogami Shinji,
Taniyama Tomoyasu
Publication year - 2018
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201700762
Subject(s) - materials science , tetragonal crystal system , amorphous solid , magnetostriction , condensed matter physics , magnetic anisotropy , orthorhombic crystal system , anisotropy , phase (matter) , substrate (aquarium) , isotropy , crystal (programming language) , film plane , magnetometer , nuclear magnetic resonance , diffraction , crystallography , magnetization , crystal structure , optics , magnetic field , programming language , chemistry , physics , oceanography , organic chemistry , quantum mechanics , computer science , geology
The uniaxial in‐plane magnetic anisotropy constants ( K 1 ) of amorphous Co 10 Fe 74 B 16 (CoFeB) films deposited on BaTiO 3 (BTO) single‐crystal substrates are characterized using a vibrating sample magnetometer. As a result, a significant increase in K 1 with temperature is observed by a factor of 26, from 0.267 × 10 5 erg cm −3 at 300 K to 6.88 × 10 5 erg cm −3 at 230 K, and the thermal/ K 1 cycling was reproduced. Estimation of the magnetoelastic effect at the CoFeB/BTO interface demonstrated that the external stress resulting from the structural phase transition from tetragonal to orthorhombic structure in the (001) plane of BTO substrate is the primary cause of the instant magnetic anisotropy in amorphous systems with isotropic magnetostriction such as CoFeB.