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6 Apr 1998

Volume 72, Issue 14, pp. 1667-1789

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Magnetoelastic coupling and magnetic anisotropy in La0.67Ca0.33MnO3 films

J. O’Donnell, M. S. Rzchowski, J. N. Eckstein, and I. Bozovic

Appl. Phys. Lett. 72, 1775 (1998); http://dx.doi.org/10.1063/1.121181 (3 pages) | Cited 88 times

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We report the results of magnetization measurements on pseudomorphic (fully strained) c-axis oriented colossal magnetoresistance manganite thin films grown by molecular beam epitaxy. We observe uniaxial magnetic anisotropy (hard axis/easy plane) with the easy plane being the film plane. Within the plane a weaker biaxial anisotropy is observed with [100] (Mn–O bond direction) easy axes. The magnetization dependence of the uniaxial anisotropy constant follows the predicted magnetization dependence of the magnetostriction constants within single-ion models indicating that the anisotropy energy is dominated by strain-induced anisotropy from the lattice constant mismatch with the SrTiO3 substrate. These results indicate a magnetostriction constant λ100 ≈ +7×10−5, and an induced orbital moment of at least 0.02μb/Mn ion. We predict that by appropriate substrate selection an equilibrium out-of-plane magnetization can be produced. © 1998 American Institute of Physics.
Show PACS
75.70.Ak Magnetic properties of monolayers and thin films
75.30.Gw Magnetic anisotropy
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.80.+q Magnetomechanical effects, magnetostriction
68.60.Bs Mechanical and acoustical properties
68.55.-a Thin film structure and morphology
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