Title :
Stress-induced surface magnetization of (La0.7Sr0.3 )MnO3 thin films
Author :
Kwon, C. ; Lofland, S.E. ; Bhagat, S.M. ; Rajeswari, M. ; Venkatesan, Thirumalai ; Ramesh, Ramaswamy ; Kratz, A.R. ; Gomez, R.D.
Author_Institution :
Dept. of Phys., Maryland Univ., College Park, MD, USA
fDate :
9/1/1997 12:00:00 AM
Abstract :
The role of stress on magnetic properties of epitaxial (La0.7 Sr0.3)MnO3 (LSMO) films has been studied. We have investigated 1100 Å thick LSMO films deposited on LaAlO3 (Sample L, under a compressive stress) and SrTiO3 (Sample S, under a tensile stress) using magnetic force microscopy (MFM), DC hysteresis loop, and ferromagnetic resonance (FMR) measurements. The magnetic force microscope image of Sample L shows a “maze-like” pattern indicating sizable out-of-plane magnetization, while the magnetic image of Sample S shows a“feather-like” pattern indicative of an in-plane magnetization. The hysteresis loop and ferromagnetic resonance measurements give quantitative evidence for the role of the lattice mismatch between the film and the substrate in the magnetic anisotropy of the two films. Our systematic examination of various thickness LSMO films on LaAlO3 reveals that the maze pattern is exhibited only between 500 Å and 1700 Å thick films. Despite larger anisotropy, no maze pattern is observed in films thinner than 360 Å
Keywords :
ferromagnetic materials; ferromagnetic resonance; lanthanum compounds; magnetic anisotropy; magnetic epitaxial layers; magnetic force microscopy; magnetic hysteresis; magnetic semiconductors; magnetic structure; magnetisation; magnetomechanical effects; pulsed laser deposition; strontium compounds; surface magnetism; (La0.7Sr0.3)MnO3; (La0.7Sr0.3)MnO3 thin films; 1100 angstrom; 360 to 1700 angstrom; DC hysteresis loop; LaAlO3; SrTiO3; compressive stress; epitaxial (La0.7Sr0.3)MnO3 films; feather-like pattern; ferromagnetic resonance; in-plane magnetization; lattice mismatch; magnetic anisotropy; magnetic force microscopy; magnetic properties; maze-like pattern; out-of-plane magnetization; stress-induced surface magnetization; substrate; tensile stress; Compressive stress; Magnetic anisotropy; Magnetic films; Magnetic force microscopy; Magnetic forces; Magnetic hysteresis; Magnetic properties; Magnetic resonance; Magnetization; Strontium;
Journal_Title :
Magnetics, IEEE Transactions on
