斯格明子主体材料Cu2OSeO3中的磁电效应。

Magnetoelectric effects in the skyrmion host material Cu2OSeO3.

作者信息

Ruff E, Lunkenheimer P, Loidl A, Berger H, Krohns S

机构信息

Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany.

Institute of Condensed Matter Physics, EPFL, CH-1015 Lausanne, Switzerland.

出版信息

Sci Rep. 2015 Oct 8;5:15025. doi: 10.1038/srep15025.

DOI:10.1038/srep15025

PMID:26446514

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4597216/

Abstract

Insulating helimagnetic Cu2OSeO3 shows sizeable magnetoelectric effects in its skyrmion phase. Using magnetization measurements, magneto-current analysis and dielectric spectroscopy, we provide a thorough investigation of magnetoelectric coupling, polarization and dielectric constants of the ordered magnetic and polar phases of single-crystalline Cu2OSeO3 in external magnetic fields up to 150 mT and at temperatures below 60 K. From these measurements we construct a detailed phase diagram. Especially, the skyrmion phase and the metamagnetic transition of helical to conical spin order are characterized in detail. Finally we address the question if there is any signature of polar order that can be switched by an external electric field, which would imply multiferroic behaviour of Cu2OSeO3.

摘要

绝缘螺旋磁体Cu2OSeO3在其斯格明子相表现出显著的磁电效应。通过磁化测量、磁电流分析和介电光谱，我们对单晶Cu2OSeO3在高达150 mT的外磁场和低于60 K的温度下有序磁相和极性相的磁电耦合、极化和介电常数进行了全面研究。基于这些测量，我们构建了详细的相图。特别是，详细表征了斯格明子相以及螺旋自旋序到圆锥自旋序的亚磁转变。最后，我们探讨了是否存在可由外部电场切换的极性序特征的问题，这将意味着Cu2OSeO3具有多铁性行为。