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perovskite manganites were prepared. In these samples, the transition from high temperature paramagnetic insulator to low temperature ferromagnetic metal as well as the low field magnetoresistance (LFMR.... The results suggest that the high temperature LFMR effect and the applicable colossal magnetoresistance (CMR) materials could be obtained by controlling the microstructures of this class of perovskite......
the content of the dopants, the high-temperature magnetoresistance (MR) decreases, whereas low-temperature MR increases and reaches 42% at 150 K and x=0.1. However, for the LSMO/BaM composites, magnetization...%. High magnetic field has little effect on the resistivity and magnetoresistance for the composites with x>5%, which may originate from the pinning effect of BaM grains. Key words:Composites......
, depressed the particles growth. The resistivity of system increased rapidly and the metal-insulator transition temperature (TIM) and room temperature magnetoresistance decreased as the aluminum... of powder particles size and shape. Key words:magnetoresistance; metal-insulator transition; exchange interactions; transport property; rare earths; [全文内容正在添加中] ......
magnetoresistance material La2/3Ca1/3MnO3 was studied.From the measurements of temperature dependence of magnetization in various magnetic fields,the large magnetic entropy change associated with the ferromagnetic...; magnetocaloric effect; colossal magnetoresistance; perovskite; entropy; rare earths; [全文内容正在添加中] ......
, and different magnetoresistance effect. These changes had a significant degree of correlation with the valence of doped ions. From Fe, Ti to Nb doping, the effect was doubly stronger. The results could...-exchange; transition temperature; magnetoresistance; rare earths; [全文内容正在添加中] ......
for the conduction mechanism. Magnetoresistance results were explained by a two-level model of tunneling MR and percolation model. Key words:tunneling magnetoresistance; manganites; composite materials......
-spin-valve (PSV) sandwiches using amorphous CoNbZr alloy as soft magnetic layer were fabricated by magnetron sputtering. The giant magnetoresistance (GMR) and its dependence on the thickness...: giant magnetoresistance; pseudo-spin-valve; amorphous ferromagnetic layer; Camley-Barnas model 1 Introduction Pseudo-spin-valve (PSV) sandwiches using very thin amorphous film as soft layer......
by the random distribution of Mn ions. A maximum magnetoresistance ratio as large as 90% in 1 T at 122 K was obtained for the sample with x=0.055, which is four times larger than that obtained for LCMO...; colossal magnetoresistance; spin cluster; rare earths; [全文内容正在添加中] ......
injection. Key words:metal materials; colossal magnetoresistance; superconductivity; injection-current; rare earths; [全文内容正在添加中] ......
隧道磁电阻效应的原理及应用 拜山·沙德克1,吉吾尔·吉里力1 (1.新疆大学物理科学与技术学院,乌鲁木齐,830046) 摘要:隧道磁电阻具有饱和磁场低,工作磁场小,灵敏度高,温度系数小等优点,在磁随机存取存储器(MRAM),TMR磁头和磁传感器等自旋电子器件上颇受欢迎,有着广阔的应用前景.重点介绍了隧道磁电阻效应中自旋相关输运特点及原理,阐述了最近几年国内外最新研究进展,最后讨论了隧道磁电阻效应在实际应用中所面临的一些问题. 关键词:隧道磁电阻效应; 磁隧道结; MgO; Al2O3; tunneling magnetoresistance; magnetic tunneling junction; MgO; Al2O3; [全文内容正在添加中] ......
