Ferromagnetic Antiresonance and Giant Microwave Magneto-Impedance in Polycrystalline La0.49Sr0.51MnO3  

作　　者：柳文军 舒启清 S. M. BHAGAT I. O. TROYANCHUK 

机构地区：[1]College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060 [2]Shenzhen Key Laboratory of Special Functional Materials, Shenzhen 518060 [3]Department of Physics, University of Maryland, College Park, Maryland 20742-4111, USA [4]Institute of Solid State and Semiconductor Physics, National Academy of Sciences of Belarus, P. Brovki Street 17, Minsk 220072, Belarus

出　　处：《Chinese Physics Letters》2008年第3期1124-1127,共4页中国物理快报（英文版）

摘　　要：The ferromagnetic antiresonance （FMAR） phenomenon, i.e., the minimum of the microwave absorption, in polycrystalline La0.49Sr0.51MnO3 is observed near Curie temperature TC = 282 K. Temperature-dependences of magnetization μ0M are obtained from the FMAR. The results show that as μ0H = 0, by fitting the scaling law M ∝ （TC -T）^β to temperature-dependences of μ0M at the different microwave frequencies, it yields TC=281.2 K and β = 0.47. However, temperature-dependences of μ0M under different μ0H are not in agreement with the scaling law. Due to FMAR, about 40% giant microwave magneto-impedance at 11.9 GHz can occur under a low field μ0H = 0.03 T.The ferromagnetic antiresonance （FMAR） phenomenon, i.e., the minimum of the microwave absorption, in polycrystalline La0.49Sr0.51MnO3 is observed near Curie temperature TC = 282 K. Temperature-dependences of magnetization μ0M are obtained from the FMAR. The results show that as μ0H = 0, by fitting the scaling law M ∝ （TC -T）^β to temperature-dependences of μ0M at the different microwave frequencies, it yields TC=281.2 K and β = 0.47. However, temperature-dependences of μ0M under different μ0H are not in agreement with the scaling law. Due to FMAR, about 40% giant microwave magneto-impedance at 11.9 GHz can occur under a low field μ0H = 0.03 T.

关 键 词：MAGNETORESISTANCE MANGANITES LA0.7SR0.3MNO3 

分 类 号：O44[理学—电磁学]