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Enhancement of magnetic anisotropy in mechanically attrited Cr2O3 nanoparticles |
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| Authors: | Partha HajraPradip Brahma Saurav DuttaSourish Banerjee Dipankar Chakravorty |
| Institution: | a MLS Professor's Unit, Indian Association for the Cultivation of Science, 2A and 2B Raja S.C. Mullick Road, Kolkata 700032, India b Department of Physics, Gurudas College, Kolkata 700054, India c Department of Physics, Rammohan College, 102/1 Raja Rammohan Roy Sarani, Kolkata 700009, India d Department of Physics, Calcutta University, Kolkata 700009, India |
| Abstract: | Cr2O3 nanoparticles of sizes from 24 to 12 nm were synthesized by mechanical grinding. Magnetic hysteresis loops were observed in the temperature range 5-300 K. Zero-field magnetization measurements showed two peaks, at low temperature in the range 36-52 K and at high temperature in the range 255-290 K. They were found to shift to higher temperatures as the particle size was reduced. This was ascribed due to the enhancement of the effective anisotropy constant with a decrease in particle size. The exchange bias was found to increase as the particle size became smaller. This is believed to arise due to an increase in uncompensated spins as a result of large surface area created. |
| Keywords: | Magnetic anisotropy Exchange bias |
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