Magnetic domain structures of La0.67Sr0.33MnO3 thin films with different morphologies

Abstract

Using a wide-field Kerr microscope, we have studied the magnetic domain structures of epitaxial and polycrystalline La 0.67 Sr 0.33 MnO 3 thin films as well as a film having thermally induced ͗110͘ microcracks. The epitaxial film on a ͑001͒ SrTiO 3 substrate has different magnetic domain behaviors for in-plane fields applied along the ͗100͘ and ͗110͘ directions. Magnetic domain orientation and contrast suggest a biaxial magnetic anisotropy with ͗110͘ easy axes. Defects such as microcracks and grain boundaries have a strong perturbing effect on the local magnetization and can lead to an enhanced and controllable spin-dependent scattering.

Tailoring magnetic anisotropy in epitaxial half metallic La0.7Sr0.3MnO3 thin films

“…18 In particular, the strain in LSMO thin films deposited on SrTiO 3 (STO) (001) is in-plane tensile, and an in-plane biaxial magnetic anisotropy is generally observed, with the easy in-plane direction along 100 h i and the hard in-plane direction along 100 h i. [18][19][20][21][22][23] In the case of LSMO grown onto STO(110), the substrate induces a strain that is anisotropic in-plane (i.e., the two in-plane directions of strain are inequivalent). This causes an in-plane uniaxial magnetic anisotropy, with the a)…”

Mn55NMR and magnetization studies ofLa0.67Sr0.33Sidorenko1, Allodi2, Renzi3 et al. 2006Phys. Rev. B283191View full textAdd to dashboardCite

“…In the manganite films, the substrate-induced strain affects magnetoresistivity, 1,2,3 Curie temperature, 4 and magnetic microstructure 5,6 . In particular, the magnetic anisotropy energy in the thin manganite films strongly depends on strain and, therefore, on the substrate material, film thickness, and deposition parameters.…”

Giant Enhancement of Magnetic Anisotropy in Ultrathin Manganite Films via Nanoscale 1D Periodic Depth Modulation

“…There are several mechanisms that can modify the direction and magnitude of magnetic anisotropy in LSMO, including magnetostatic energy induced shape anisotropy [7], step edge effects [31,32], and epitaxial strain [8,[28][29][30]. Shape anisotropy and step edge effects can be ruled out as possible origins based on three observations.…”

“…[110] or 11 0 for LSMO on STO [28][29][30]. The abrupt resistance switching corresponds to the sharp jump of the magnetization between two easy axes when the magnetic field is swept across the hard axis.…”