Magnetic behaviour of interacting antiferromagnetic nanoparticles

被引：11

作者：

Markovich, V. ^{[1
]}

Puzniak, R. ^{[2
]}

Skourski, Y. ^{[3
]}

Wisniewski, A. ^{[2
]}

Mogilyanski, D. ^{[4
]}

Jung, G. ^{[1
]}

Gorodetsky, G. ^{[1
]}

机构：

[1] Ben Gurion Univ Negev, Dept Phys, IL-84105 Beer Sheva, Israel

[2] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland

[3] Helmholtz Zentrum Dresden Rossendorf, Dresden High Magnet Field Lab, D-01314 Dresden, Germany

[4] Ben Gurion Univ Negev, Analyt Res Serv & Instrumentat Unit, IL-84105 Beer Sheva, Israel

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2012年 / 24卷 / 26期

关键词：

MOSSBAUER-SPECTRA; PARTICLES; DYNAMICS; FIELD;

D O I：

10.1088/0953-8984/24/26/266001

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Magnetic properties of interacting La0.2Ca0.8MnO3 nanoparticles have been investigated. The field-induced transition from antiferromagnetic (AFM) to ferromagnetic (FM) state in the La0.2Ca0.8MnO3 bulk has been observed at exceptionally high magnetic fields. For large particles, the field-induced transition widens while magnetization progressively decreases. In small particles the transition is almost fully suppressed. The thermoremanence and isothermoremanence curves constitute fingerprints of irreversible magnetization originating from nanoparticle shells. We have ascribed the magnetic behaviour of nanoparticles to a core-shell scenario with two main magnetic contributions; one attributed to the formation of a collective state formed by FM clusters in frustrated coordination at the surfaces of interacting AFM nanoparticles and the other associated with inner core behaviour as a two-dimensional diluted antiferromagnet.

引用

页数：8

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