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Bihui HOU , Qinlun XU , Shizhuo JI , Tianpei ZHANG and Peng PENG (Dept. of Physics , University of Science & Technology of China , Hefei 230026 , China) Changhe SHANG and Yinjun WANG (State Key Lab. of Magnetism , Institute of Physics , Chinese Academy of Science
材料科学技术（英）
An anomalous Kerr loop was observed in an oriented LaBaMno film annealed in oxygen. Many tiny crystal columns were observed with scanning tunneling microscope and magnetic force microscope. The magnetic moment m in the column is perpendicular outward to the surface, which forms a surface phase with spin pinning state. This spin pinning results in the obvious asymmetrical Kerr loop of magneto-optical effect when the magnetic field is in the two opposite directions vertical to the surface.
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