"Emergent Spin Glass Behavior Created by Self-Assembled Antiferromagnet" by Roshan Nepal, Zhen Wang et al.

Faculty Publications

Title

Emergent Spin Glass Behavior Created by Self-Assembled Antiferromagnetic NiO Columns in Ferrimagnetic NiFeO

Authors

Roshan Nepal, Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, United States.
Zhen Wang, Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, United States.
Samuel Dai, Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, United States.
Mohammad Saghayezhian, Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, United States.
Yimei Zhu, Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, United States.
E Ward Plummer, Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, United States.
Rongying Jin, Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, United States.

Document Type

Article

Publication Date

8-26-2020

Abstract

Spin glass (SG) is a magnetic state with spin structure incommensurate with lattice and charge. Fundamental understanding of its behavior has a profound impact on many technological problems. Here, we present a novel case of interface-induced spin glass behavior via self-assembly of single-crystalline NiO microcolumns in a single-crystalline NiFeO matrix. Scanning transmission electron microscopy indicates that the hexagonal-shaped NiO columns are along their [211] direction and oriented along the [111] direction of the NiFeO matrix. Magnetic force microscopy reveals magnetic anisotropy between NiO columns (antiferromagnetic transition temperature ∼ 523 K) and NiFeO matrix (ferrimagnetic transition temperature ∼ 860 K). This leads to spin disorder/frustration at atomically sharp NiFeO/NiO interfaces responsible for spin glass behavior below ∼ 28 K. Our results demonstrate that self-assembly of magnetically distinct microstructures into another crystalline and magnetically ordered matrix is an effective way to create novel spin states at interfaces.

Publication Source (Journal or Book title)

ACS applied materials & interfaces

First Page

38788

Last Page

38795

Recommended Citation

Nepal, R., Wang, Z., Dai, S., Saghayezhian, M., Zhu, Y., Plummer, E. W., & Jin, R. (2020). Emergent Spin Glass Behavior Created by Self-Assembled Antiferromagnetic NiO Columns in Ferrimagnetic NiFeO. ACS applied materials & interfaces, 12 (34), 38788-38795. https://doi.org/10.1021/acsami.0c10790

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