Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1606216 | Journal of Alloys and Compounds | 2016 | 5 Pages |
Abstract
We have successfully synthesized the CuCr2O4/Cr2O3 nanogranular system through a high-temperature phase separation route from Cu doped Cr2O3 nanoparticles, which are confirmed by X-ray diffraction measurements. Magnetic susceptibility shows two magnetic transitions at 130Â K and 310Â K corresponding to the ferrimagnetic and antiferromagnetic phases of CuCr2O4 and Cr2O3, respectively. Significant exchange bias behavior could be observed in the field cooling magnetic hysteresis loop at low temperatures. Both exchange bias field (HEB) and coercive field (HC) decrease with increasing temperature and disappear near 200Â K. This exchange bias behavior is discussed in terms of the existence of exchange coupling between the ferrimagnetic CuCr2O4 and antiferromagnetic Cr2O3. The uncompensated spins in antiferromagnetic phase frozen along field cooling direction provide the pinning force on the ferrimagnetic spins leading to the exchange bias effect.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Y.X. Gao, C.M. Zhu, L.G. Wang, Q. Guo, Z.M. Tian, S.L. Yuan,