标题：The phenomenon of positive magnetoimpedance in La0.75Sr0.25MnO3PLD film
作者：Wang, Yifei ;Liu, Hua ;Hu, Jifan
作者机构：[Wang, Yifei ;Liu, Hua ;Hu, Jifan ] School of Physics, State Key Laboratory for Crystal Materials, Shandong University, Jinan 250100, China
会议名称：Progress in Electromagnetics Research Symposium, PIERS 2011 Suzhou
会议日期：September 12, 2011 - September 16, 2011
来源：Progress in Electromagnetics Research Symposium
摘要：In the present work, La0.75Sr0.25MnO3polycrystalline film was grown on Si (100) substrate by pulsed laser deposition. Negative magnetoimpedance ΔZ/Z0= -2.64% was obtained under a low field of 500 Oe for the film with an 800°C annealing. For the film with a liquid nitrogen treatment after an 800°C annealing, a positive magnetoimpedance occurs at 10 MHz. The peak value of ΔZ/Z0is 48.1% under 200 Oe. We suggested that the negative magnetoimpedance for the film with 800°C 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 χ. When a transverse anisotropy field HAexists, the transverse susceptibility χ should have a peak at a field H = HA.