| Original Articles |
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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 |
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| Cite this article: |
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LIU Wen-Jun, SHU Qi-Qing, S. M. BHAGAT et al 2008 Chin. Phys. Lett. 25 1124-1127 |
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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.
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| Keywords:
78.70.Gq
76.50.+g
75.47.Gk
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Received: 23 August 2007
Published: 27 February 2008
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| PACS: |
78.70.Gq
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(Microwave and radio-frequency interactions)
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76.50.+g
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(Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance)
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75.47.Gk
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(Colossal magnetoresistance)
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