title: Anisotropic magnetocaloric effect in nanostructured magnetic clusters.
abstract: We report the first experimental observation of anisotropic magnetocaloric effect (MCE) in the Fe8 clusters. It is found that the magnetic anisotropy plays a very important role in the determination of the magnetocaloric effect. The maximum and minimum MCE's are observed when the applied magnetic fields are parallel and perpendicular to the easy axis, respectively. The quantum spin Hamiltonian of a Fe8 cluster is used to calculate the partition function and the magnetization in a range of temperature and magnetic field. Excellent quantitative agreement between the experimental data and calculation is observed.
authors.affiliation: Department of Physics and Institute of Nano Science and Technology (INST), The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China. phxxz@ust.hk
authors.forename: X X
authors.initials: XX
authors.lastname: Zhang
authors.forename: H L
authors.initials: HL
authors.lastname: Wei
authors.forename: Z Q
authors.initials: ZQ
authors.lastname: Zhang
authors.forename: L
authors.initials: L
authors.lastname: Zhang