The magnetic inhomogeneities in the double perovskite ceramics have been investigated by means of ferromagnetic resonance spectra and magnetization measurements. The experimental results show that the peak-to-peak linewidth increases with decreasing temperature from 450 to 294 K. Meanwhile, the samples exhibit a remarkable coercivity up to 1050 Oe at room temperature in magnetic field of 18.3 kOe, and hard to attain saturation in magnetization. All these behaviors are symptomatic of magnetic inhomogeneities in the samples. The magnetoresistance (MR), arising from spin-polarized carriers tunneling at the grain boundaries, is about 24% at 6 K in magnetic field of 50 kOe. The MR decreases with elevating temperature and is nearly zero at room temperature. These studies clearly reveal that the magnetically soft character in this system is a prerequisite to enhance low-field magnetoresistance at room temperature. The investigation of x-ray photoemission spectra indicates that the ground state of adopts configuration. The superexchange interaction between Cr and W ions leads to ferrimagnetic ordering below Curie temperature
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1 January 2003
Research Article|
January 01 2003
Magnetic inhomogeneity and valence state in double perovskite Available to Purchase
Jinhui Wang;
Jinhui Wang
Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
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Gongqiang Liu;
Gongqiang Liu
CCAST(World Laboratory), P.O. Box 8730, Beijing 100080, People’s Republic of China
Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
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Wei Zhong;
Wei Zhong
Department of Physics, Nanjing University, Nanjing 210093, People’s Republic of China
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Youwei Du
Youwei Du
Department of Physics, Nanjing University, Nanjing 210093, People’s Republic of China
Search for other works by this author on:
Jinhui Wang
Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
Gongqiang Liu
CCAST(World Laboratory), P.O. Box 8730, Beijing 100080, People’s Republic of China
Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
Wei Zhong
Department of Physics, Nanjing University, Nanjing 210093, People’s Republic of China
Youwei Du
Department of Physics, Nanjing University, Nanjing 210093, People’s Republic of China
J. Appl. Phys. 93, 471–474 (2003)
Article history
Received:
June 21 2002
Accepted:
October 06 2002
Citation
Jinhui Wang, Gongqiang Liu, Wei Zhong, Youwei Du; Magnetic inhomogeneity and valence state in double perovskite. J. Appl. Phys. 1 January 2003; 93 (1): 471–474. https://doi.org/10.1063/1.1524710
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