The Phenomenon of Positive Magnetoimpedance in La0.75Sr0.25MnO3 PLD Film
In the present work,La0.75Sr0.25MnO3 polycrystalline film was grown on Si(100)substrate by pulsed laser deposition.Negative magnetoimpedance △Z=Z0 =-2.64%was obtained under a low field of 500 Oe for the film with an 800℃ annealing.For the film with a liquid nitrogen treatment after an 800℃ annealing,a positive magnetoimpedance occurs at 10 MHz.The peak value of △Z=Z0 is 48.1%under 200 Oe.We suggested that the negative magnetoimpedance for the film with 800℃ annealing is connected with a decrease of permeability induced by DC low fields,whereas the positive magnetoimpedance for the film with liquid-nitrogen treatment was connected with an increase of permeability with field,due to the existence of transverse anisotropy developed in the film during the liquid-nitrogen treatment process.With Machado-Rezende model on magnetic domain motion,we calculated the field dependence of transverse susceptibility X.When a transverse anisotropy field HA exists,the transverse susceptibility X should have a peak at a field H = HA.
Yifei Wang Hua Liu Jifan Hu
School of Physics,State Key Laboratory for Crystal Materials Shandong University,Jinan 250100,China
国际会议
Progress in Electromagnetics Research Symposium 2011(2011年电磁学研究新进展学术研讨会)
苏州
英文
44-47
2011-09-01（万方平台首次上网日期，不代表论文的发表时间）