Emergent Spin Glass Behavior Created by Self-Assembled Antiferromagnetic NiO Columns in Ferrimagnetic NiFe 2 O 4 .

Autor: Nepal R; Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, United States., Wang Z; Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, United States.; Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, United States., Dai S; Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, United States., Saghayezhian M; Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, United States., Zhu Y; Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, United States., Plummer EW; Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, United States., Jin R; Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, United States.
Jazyk: angličtina
Zdroj: ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2020 Aug 26; Vol. 12 (34), pp. 38788-38795. Date of Electronic Publication: 2020 Aug 14.
DOI: 10.1021/acsami.0c10790
Abstrakt: 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 NiFe 2 O 4 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 NiFe 2 O 4 matrix. Magnetic force microscopy reveals magnetic anisotropy between NiO columns (antiferromagnetic transition temperature T N ∼ 523 K) and NiFe 2 O 4 matrix (ferrimagnetic transition temperature T FI ∼ 860 K). This leads to spin disorder/frustration at atomically sharp NiFe 2 O 4 /NiO interfaces responsible for spin glass behavior below T SG ∼ 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.
Databáze: MEDLINE
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