Ferromagnetic properties of epitaxial manganite films on SrTiO3/Si heterostructures

Pradhan, A. K.; Dadson, J. B.; Hunter, D.; Zhang, K.; Mohanty, S.; Jackson, E. M.; Lasley-Hunter, B.; Lord, K.; Williams, T. M.; Rakhimov, R. R.; Zhang, J.; Sellmyer, D. J.; Inaba, K.; Hasegawa, T.; Mathews, S.; Joseph, B.; Sekhar, B. R.; Roy, U. N.; Cui, Y.; Burger, A.

doi:doi:10.1063/1.2222402

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Lorentz microscopy studies of domain wall trap structures

Domain wall traps of varying geometry have been studied using Lorentz microscopy in a transmission electron microscope. Electron beam lithography and lift-off were used to fabricate the elements whose shape allowed the formation of a head-to-head domain structure in the central section. Previous micromagnetic simulations have shown that different head-to-head configurations are possible depending on the width and thickness of the strip. In the majority of our in situ magnetizing experiments a v...

Magnetic domain pinning in an anisotropy-engineered GdTbFe thin film

Focused ion beam irradiation was used to reduce locally the perpendicular anisotropy of magnetic thin films in rectangular lattices of 50 nm sized dots. The effect of the anisotropy patterns, differing in ion fluence and interdot spacing, on the magnetization reversal process was determined in q space with x-ray resonant magnetic scattering and in real space with magnetic force microscopy. At remanence only a slight alignment of the irregularly shaped domains is observed. In perpendicular magne...

We report on the magnetic properties of epitaxial La_0.7Ba_0.3MnO₃ and La_0.7Sr_0.3MnO₃ films on Si (100) and Si (111) substrates using SrTiO₃ template layer, which demonstrate magnetic and electrical properties at and above room temperature. The magnetization data show magnetic transition and magnetic hysteresis at and above room room temperature. The films show well-defined magnetic domains. The ferromagnetic resonance studies show anisotropic effects related to ferromagnetic properties of films. The smaller grain size of about 20 nm in manganite films on SrTiO₃/Si may be one of the reasons to minimize the strain effect through strain relaxation at the interface between SrTiO₃ and manganites through the formation of three-dimensonal islands.

Article Outline

INTRODUCTION
EXPERIMENT
RESULTS AND DISCUSSION
CONCLUSION

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KEYWORDS and PACS

Keywords

lanthanum compounds, barium compounds, strontium compounds, ferromagnetic materials, magnetic epitaxial layers, magnetic anisotropy, magnetic domains, magnetic hysteresis, grain size, ferromagnetic resonance, magnetic transitions

PACS

75.70.Ak

Magnetic properties of monolayers and thin films
75.30.Kz

Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.30.Gw

Magnetic anisotropy
75.70.Kw

Domain structure (including magnetic bubbles and vortices)
75.60.Ej

Magnetization curves, hysteresis, Barkhausen and related effects
75.50.Dd

Nonmetallic ferromagnetic materials

ARTICLE DATA

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http://dx.doi.org/10.1063/1.2222402

PUBLICATION DATA

ISSN

0021-8979 (print)

1089-7550 (online)

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American Institute of Physics

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