title: Positive to negative zero-field cooled exchange bias in La0.5Sr0.5Mn0.8Co0.2O3 ceramics.
abstract: Exchange bias effect obtained after zero-field cooling from unmagnetized state usually exhibits a shift of hysteresis loop negative to the direction of the initial magnetic field, known as negative zero-field cooled exchange bias. Here, positive zero-field cooled exchange bias is reported in La0.5Sr0.5Mn0.8Co0.2O3 ceramics. In addition, a transition from positive to negative exchange bias has been observed with increasing initial magnetization field and measurement temperature. Based on a simple spin bidomain model with variable interface, two type of interfacial spin configuration formed during the initial magnetization process are proposed to interpret the observed phenomenon.
authors.affiliation: Wuhan National High Magnetic Field Center &School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
authors.forename: Cui
authors.initials: C
authors.lastname: Shang
authors.affiliation: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Hubei Key Laboratory of Ferro &Piezoelectric Materials and Devices, Faculty of Physics and Electronic Science, Hubei University, Wuhan 430062, People's Republic of China.
authors.forename: Shaopu
authors.initials: S
authors.lastname: Guo
authors.affiliation: Wuhan National High Magnetic Field Center &School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.|Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Hubei Key Laboratory of Ferro &Piezoelectric Materials and Devices, Faculty of Physics and Electronic Science, Hubei University, Wuhan 430062, People's Republic of China.
authors.forename: Ruilong
authors.initials: R
authors.lastname: Wang
authors.affiliation: State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, People's Republic of China.
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Sun
authors.affiliation: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Hubei Key Laboratory of Ferro &Piezoelectric Materials and Devices, Faculty of Physics and Electronic Science, Hubei University, Wuhan 430062, People's Republic of China.
authors.forename: Haibo
authors.initials: H
authors.lastname: Xiao
authors.affiliation: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Hubei Key Laboratory of Ferro &Piezoelectric Materials and Devices, Faculty of Physics and Electronic Science, Hubei University, Wuhan 430062, People's Republic of China.
authors.forename: Lingfang
authors.initials: L
authors.lastname: Xu
authors.affiliation: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Hubei Key Laboratory of Ferro &Piezoelectric Materials and Devices, Faculty of Physics and Electronic Science, Hubei University, Wuhan 430062, People's Republic of China.
authors.forename: Changping
authors.initials: C
authors.lastname: Yang
authors.affiliation: Wuhan National High Magnetic Field Center &School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
authors.forename: Zhengcai
authors.initials: Z
authors.lastname: Xia