Ferromagnetic Antiresonance and Giant Microwave Magneto-Impedance in Polycrystalline La0.49Sr0.51MnO3
LIU Wen-Jun1,2, SHU Qi-Qing1,2, S. M. BHAGAT3, I. O. TROYANCHUK4
1College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060 2Shenzhen Key Laboratory of Special Functional Materials, Shenzhen 5180603Department of Physics, University of Maryland, College Park, Maryland 20742-4111, USA4Institute of Solid State and Semiconductor Physics, National Academy of Sciences of Belarus, P. Brovki Street 17, Minsk 220072, Belarus
Ferromagnetic Antiresonance and Giant Microwave Magneto-Impedance in Polycrystalline La0.49Sr0.51MnO3
LIU Wen-Jun1,2;SHU Qi-Qing1,2;S. M. BHAGAT3;I. O. TROYANCHUK4
1College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060 2Shenzhen Key Laboratory of Special Functional Materials, Shenzhen 5180603Department of Physics, University of Maryland, College Park, Maryland 20742-4111, USA4Institute of Solid State and Semiconductor Physics, National Academy of Sciences of Belarus, P. Brovki Street 17, Minsk 220072, Belarus
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 = 282K. 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 = 281.2K and β= 0.47. However, temperature-dependences of β0M under different β0H are not in agreement with the scaling law. Due to FMAR, about 40% giant microwave magneto-impedance at 11.9GHz can occur under a low field μ0H=0.03T.
Abstract：The ferromagnetic antiresonance (FMAR) phenomenon, i.e., the minimum of the microwave absorption, in polycrystalline La0.49Sr0.51MnO3 is observed near Curie temperature TC = 282K. 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 = 281.2K and β= 0.47. However, temperature-dependences of β0M under different β0H are not in agreement with the scaling law. Due to FMAR, about 40% giant microwave magneto-impedance at 11.9GHz can occur under a low field μ0H=0.03T.
LIU Wen-Jun;SHU Qi-Qing;S. M. BHAGAT;I. O. TROYANCHUK. Ferromagnetic Antiresonance and Giant Microwave Magneto-Impedance in Polycrystalline La0.49Sr0.51MnO3[J]. 中国物理快报, 2008, 25(3): 1124-1127.
LIU Wen-Jun, SHU Qi-Qing, S. M. BHAGAT, I. O. TROYANCHUK. Ferromagnetic Antiresonance and Giant Microwave Magneto-Impedance in Polycrystalline La0.49Sr0.51MnO3. Chin. Phys. Lett., 2008, 25(3): 1124-1127.
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2008, Vol. 25 
