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High coercivity in large exchange-bias Co/CoO-MgO nano-granular films

Chinese Physics B 2015年第3期24卷 218-223页

作者：葛传楠万贤纲 Eric Pellegrin 胡志伟 Wen-I Liang Michael Bruns 邹文琴都有为 National Laboratory of Solid State Microstructures and Department of Physics Nanjing University Department of Physics Jiangsu Second Normal University CELLS-ALBA Synchrotron Radiation Facility Max Planck Institute for Chemical Physics of Solids Lawrence Berkeley National Lab Materials Science Division Haimei Zheng laboratory Institute for Applied Materials (IAM) Karlsruhe Institute of Technology (KIT)

We present a detailed study on the magnetic coercivity of Co/CoO-MgO core-shell systems, which exhibits a large exchange bias due to an increase of the uncompensated spin density at the interface between the CoO shell and the metallic Co core by replacing Co by Mg within the CoO shell. We find a large magnetic coercivity of 7120 Oe around the electrical percolation threshold of the Co/CoO core/shell particles, while samples with a smaller or larger Co metal volume fraction show a considerably smaller coercivity. Thus, this study may lead to a route to improving the magnetic properties of artificial magnetic material in view of potential applications.

关键词： granular films exchange bias coercivity

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Magnetic properties and magnetoresistance of Co_xC_(1-x) granular films prepared by magnetron sputtering

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Science China(Physics,Mechanics & Astronomy) 2011年第7期54卷 1218-1222页

作者： MA Lei LIU ZhongWu ZENG DeChang ZHONG XiaPing ZHANG XiaoZhong School of Materials Science and Engineering South China University of Technology Guangzhou 510640 China Department of Matertals Sctence and Engtneermg Tsinghua University Beijing 100084 China

Amorphous CoxC1-x granular films were prepared on n-Si（100） substrate by dc magnetron sputtering. The effects of Co con- centration, film thickness and annealing temperature on the magnetic properties and magnetoresistance （MR） were investigated After annealing at 500℃ for 0.5 hour, the Co（002） peak of the CoxC1-x（x〉2.5 at.%） films was observed, but cracks appeared in the films. Saturation magnetization Ms increased steadily with the increase of Co concentration from 2.5 at.% to 50 at.% and also increased with annealing temperature from room temperature to 400℃. The coercivity of CoxC1-x films was less than 180 Oe. The as-deposited Co2.5C97.5 granular films with 80 nm thickness showed a highly positive MR, up to 15.5% at a magnetic field of 0.8 T, observed at T=300 K when the external magnetic field was perpendicular to the film surface. With increasing film thickness and annealing temperature, the value of MR was found to decrease gradually and changed from positive to neg- ative. The MR effect of the CoxC1-x granular films can be explained by p-n heterojunction theory and interface scattering ef- fect.

关键词： Co-C films granular films magnetoresistance magnetron sputtering

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Influence of Pr Content on the Sructure and Giant Magnetoresistance of Pr_x(Co_(40)Ag_(60))_(100-x) granular films

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Journal of Wuhan University of Technology(Materials Science) 2011年第1期26卷 1-3页

作者：成钢 School of Materials Science and Engineering Guilin University of Electronic Technology Guangxi Key Laboratory of Information Materials

Prx（Co40Ag60）100-x （x=0, 0.5, 1, 1.5, 2, 3） granular films have been prepared by DC magneto controlled sputtering method. The XRD data indicated that Pr element favors the （111） plane preferential orientation. Magnetic measurements indicate that the average size of magnetic particles decreases as Pr content increases. For relatively low addition of Pr to CoAg granular films, Pr element can enhance GMR value and a peak value of about -14.3% is obtained at x=1.

关键词： giant magnetoresistance granular films magnetic particle

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