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Title:Real-space magnetic imaging of the spinel MnV2O4
Author(s):Wolin, Brian Augustus
Director of Research:Budakian, Raffi
Doctoral Committee Chair(s):Cooper, Lance
Doctoral Committee Member(s):Martinez Outschoorn, Verena; Clark, Bryan
Department / Program:Physics
Discipline:Physics
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):spinel
spinels
multiferroic
multiferroics
multiferroism
MFM
magnetic force microscopy
MnV2O4
magnetic imaging
strain
quantitative MFM
quantitative magnetic force microscopy
Abstract:Controlling multiferroic behavior in materials will enable the development of a wide variety of technological applications. However, the exact mechanisms by which multiferroic behavior arises in many materials are not well understood. One such class of materials are the spinels, including MnV2O4. Bulk probe studies of this compound have yielded conflicting and inconclusive results. To inform the debate and better understand the underlying physics, we performed magnetic force microscopy measurements on two MnV2O4 samples with differing degrees of mechanical strain. These local investigations revealed sub-um-scale patterns in the magnetic structure in both samples. In one case, the magnetization of these stripes is estimated at Mz ~ 10^5 A/m, which is on the order of previous saturation magnetization measurements. The discovery of such large inhomogeneities necessitates revision of theoretical proposals and reinterpretation of experimental data regarding the low-temperature phases of the spinels. Similar MFM measurements of a related material (Mn3O4) provide evidence that magnetic inhomogeneity is a common feature in the magnetically ordered phases of multiferroic spinel compounds.
Issue Date:2017-05-01
Type:Thesis
URI:http://hdl.handle.net/2142/98089
Rights Information:Copyright 2017 Brian Wolin
Date Available in IDEALS:2017-09-29
Date Deposited:2017-08


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