High field magnetoresistance in Co-Al-O nanogranular films

被引：13

作者：

Chayka, O

Kraus, L

Lobotka, P

Sechovsky, V

Kocourek, T

Jelinek, M

机构：

[1] Acad Sci Czech Republ, Inst Phys, CZ-18221 Prague 8, Czech Republic

[2] Charles Univ, Fac Math & Phys, CR-12116 Prague 2, Czech Republic

[3] SAS, Inst Elect Engn, SK-84104 Bratislava, Slovakia

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2006年 / 300卷 / 02期

关键词：

grallular system; superparamagnetism; tunneling magnetoresistance;

D O I：

10.1016/j.jmmm.2005.05.015

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have studied magnetic and electrical transport properties of Co-Al-O nanogranular films. The films prepared by laser ablation consist of Co particles embedded in an insulating Al2O3 matrix. Different current-voltage characteristics are observed depending on Co concentration in the films. Tunneling magnetoresistance (TMR) shows all anomalous behavior in high magnetic fields at low temperatures. The presence of magnetic atoms dispersed in the insulator is a possible explanation of the observed anomaly of the TMR. (c) 2005 Elsevier B.V. All rights reserved.

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收藏

页码：293 / 299

页数：7

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