Defect-tuning exchange bias of ferromagnet/antiferromagnet core/shell nanoparticles by numerical study.
The influence of non-magnetic defects on the exchange bias (EB) of ferromagnet (FM)/antiferromagnet (AFM) core/shell nanoparticles is studied by Monte Carlo simulations. It is found that the EB can be tuned by defects in different positions. Defects at both the AFM and FM interfaces reduce the EB field while they enhance the coercive field by decreasing the effective interface coupling. However, the EB field and the coercive field show respectively a non-monotonic and a monotonic dependence on the defect concentration when the defects are located inside the AFM shell, indicating a similar microscopic mechanism to that proposed in the domain state model. These results suggest a way to optimize the EB effect for applications.
Department of Physics, South China University of Technology, Guangzhou 510640, People's Republic of China.
Zhongquan
Z
Mao
Xiaozhi
X
Zhan
Xi
X
Chen
D008280:Magnetics; D059346:Magnets / Q000737:chemistry*; D009010:Monte Carlo Method; D053758:Nanoparticles / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D010316:Particle Size
D010087:Oxides