Magnetic anisotropy of ferromagnetic La[sub 0.7]Sr[sub 0.3]MnO[sub 3] epitaxial thin films: Dependence on temperature and film thickness

Steenbeck, K.; Habisreuther, T.; Dubourdieu, C.; Se´nateur, J. P.
May 2002
Applied Physics Letters;5/6/2002, Vol. 80 Issue 18, p3361
Academic Journal
The magnetic anisotropy of (001) oriented La[sub 0.7]Sr[sub 0.3]MnO[sub 3] films of thickness t=7-156 nm, deposited on LaAlO[sub 3] substrates, was measured by torque magnetometry in the temperature range T=10-300 K. For t≥50 nm and H rotating out of plane the anisotropy K[sub u] agrees well with shape anisotropy. For thinner films, K[sub u] is reduced and its sign is reversed for t=7 nm and T<70 K; this can be explained by a perpendicular anisotropy K[sub u∈] due to lattice strain. The crystal anisotropy constant K[sub 1] was determined from the biaxial in-plane anisotropy. At T=100 K K[sub 1] differed by no more than 50% from the mean value -8 kJ/m³ in the thickness region investigated. K[sub 1] was much less dependent on the thickness t and strain relaxation in the films than K[sub u∈].


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