Exchange bias driven by the structural/magnetic transition in Mn-doped SrRuO3

被引：8

作者：

Fita, I. ^{[1
]}

Puzniak, R. ^{[1
]}

Markovich, V. ^{[2
]}

Wisniewski, A. ^{[1
]}

Iwanowski, P. ^{[1
]}

Kolesnik, S. ^{[3
]}

Dabrowski, B. ^{[3
]}

机构：

[1] Polish Acad Sci, Inst Phys, Aleja Lotnikow 32-46, PL-02668 Warsaw, Poland

[2] Ben Gurion Univ Negev, Dept Phys, POB 653, IL-84105 Beer Sheva, Israel

[3] No Illinois Univ, Dept Phys, De Kalb, IL 60115 USA

来源：

CERAMICS INTERNATIONAL | 2016年 / 42卷 / 07期

关键词：

Exchange bias; Phase transition; Ruthenates;

D O I：

10.1016/j.ceramint.2016.02.065

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Magnetic properties of bulk polycrystalline Mn-doped SrRu(1-x)MnxO(3) perovskite, at doping range 0.2 <= x <= 0.3, were studied by both magnetization and ac-susceptibility measurements. It was found that the exchange bias (EB) effect emerges with increasing Mn doping in SrRu(1-x)MnxO(3) at x approximate to 0.25, following the ferromagnetic (FM) to antiferromagnetic (AFM) phase transition. This transition is accompanied with the change in structure symmetry and then the EB field, H-EB, increases significantly in doping range 0.25 < x <= 0.3. The EB effect was verified by both cooling magnetic field, H-cool, dependence of the H-EB and training effect. A markedly nonmonotonic H-EB vs. H-cool dependence with maximum at around 40 kOe was found, resembling the behavior of phase-separated EB systems. Moreover, a clear analogy with behavior of classic EB system of Pr1/3Ca2/3MnO3 was noticed, strongly suggesting that the EB effect in SrRu1-xMnxO3 originates from exchange interactions at the interface of nanoscale FM clusters (size of similar to 1.6 nm at x=0.3) coexisting together with dominant AFM phase at the boundary of the first-order FM/AFM transition. The training effect observed is well understandable within the spin-configuration relaxation model and indicates important contribution to the EB behavior from the AFM domains rearrangement at the interface. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

引用

页码：8453 / 8459

页数：7

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