title: Magnetic Properties of Cluster Glassy Ni/NiO Core-Shell Nanoparticles: an Investigation of Their Static and Dynamic Magnetization.
abstract: We review the phenomenology of the exchange bias and its related effects in core-shell nanocrystals. The static and dynamic properties of the magnetization for ferromagnetic Ni-core and antiferromagnetic NiO-shell cluster glassy nanoparticles are examined, along with the pinning-depinning process, through the measurement of the conventional exchange bias, and associated with different cooling fields and particle sizes. Two significant indexes for the dipolar interaction n and multi-anisotropic barrier β derived from the dynamic magnetization are proposed, which provide a unified picture of the exchange bias mechanism and insight into the influence of the cooling field.
authors.affiliation: Department of Physics, National Dong Hwa University, Hualien, 97401, Taiwan.
authors.forename: Jhong-Yi
authors.initials: JY
authors.lastname: Ji
authors.forename: Po-Hsun
authors.initials: PH
authors.lastname: Shih
authors.forename: Ting-Shan
authors.initials: TS
authors.lastname: Chan
authors.forename: Yuan-Ron
authors.initials: YR
authors.lastname: Ma
authors.forename: Sheng Yun
authors.initials: SY
authors.lastname: Wu