title: The effects of surface spin on magnetic properties of weak magnetic ZnLa0.02Fe1.98O4 nanoparticles.
abstract: In order to prominently investigate the effects of the surface spin on the magnetic properties, the weak magnetic ZnLa0.02Fe1.98O4 nanoparticles were chosen as studying objects which benefit to reduce as possibly the effects of interparticle dipolar interaction and crystalline anisotropy energies. By annealing the undiluted and diluted ZnLa0.02Fe1.98O4 nanoparticles at different temperatures, we observed the rich variations of magnetic ordering states (superparamagnetism, weak ferromagnetism, and paramagnetism). The magnetic properties can be well understood by considering the effects of the surface spin of the magnetic nanoparticles. Our results indicate that in the nano-sized magnets with weak magnetism, the surface spin plays a crucial rule in the magnetic properties.
authors.affiliation: Anhui Key Laboratory of Information Materials and Devices, School of Physics and Materials Science, Anhui University, Hefei 230039, People's Republic of China ; School of Physics and Electronic Information, Huaibei Normal University, Huaibei 235000, People's Republic of China.
authors.forename: Shitao
authors.initials: S
authors.lastname: Xu
authors.affiliation: Anhui Key Laboratory of Information Materials and Devices, School of Physics and Materials Science, Anhui University, Hefei 230039, People's Republic of China.
authors.forename: Yongqing
authors.initials: Y
authors.lastname: Ma
authors.affiliation: Anhui Key Laboratory of Information Materials and Devices, School of Physics and Materials Science, Anhui University, Hefei 230039, People's Republic of China.
authors.forename: Yuanfeng
authors.initials: Y
authors.lastname: Xu
authors.affiliation: Anhui Key Laboratory of Information Materials and Devices, School of Physics and Materials Science, Anhui University, Hefei 230039, People's Republic of China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Sun
authors.affiliation: Anhui Key Laboratory of Information Materials and Devices, School of Physics and Materials Science, Anhui University, Hefei 230039, People's Republic of China.
authors.forename: Bingqian
authors.initials: B
authors.lastname: Geng
authors.affiliation: Anhui Key Laboratory of Information Materials and Devices, School of Physics and Materials Science, Anhui University, Hefei 230039, People's Republic of China.
authors.forename: Ganhong
authors.initials: G
authors.lastname: Zheng
authors.affiliation: Anhui Key Laboratory of Information Materials and Devices, School of Physics and Materials Science, Anhui University, Hefei 230039, People's Republic of China.
authors.forename: Zhenxiang
authors.initials: Z
authors.lastname: Dai
keywords: Ferrite; Magnetic properties; Nanoparticles; Surface spin