Emergent Magnetic State in (111)-Oriented Quasi-Two-Dimensional Spinel Oxides

被引：10

作者：

Liu, Xiaoran ^{[1
]}

Singh, Sobhit ^{[1
]}

Kirby, Brian J. ^{[2
]}

Zhong, Zhichen ^{[3
]}

Cao, Yanwei ^{[3
]}

Pal, Banabir ^{[1
]}

Kareev, Mikhail ^{[1
]}

Middey, Srimanta ^{[4
]}

Freeland, John W. ^{[5
]}

Shafer, Padraic ^{[6
]}

Arenholz, Elke ^{[6
]}

Vanderbilt, David ^{[1
]}

Chakhalian, Jak ^{[1
]}

机构：

[1] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

[2] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA

[3] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Zhejiang, Peoples R China

[4] Indian Inst Sci, Dept Phys, Bengaluru 560012, India

[5] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[6] Lawrence Berkeley Natl Lab, Adv Photon Source, Berkeley, CA 94720 USA

来源：

NANO LETTERS | 2019年 / 19卷 / 12期

关键词：

Spinels; ultrathin films; emergent properties; magnetism; RAY CIRCULAR-DICHROISM; CLASSICAL-THEORY; FERROMAGNETISM; CLUSTERS; GROWTH;

D O I：

10.1021/acs.nanolett.9b02159

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report on the emergent magnetic state of (111)-oriented CoCr2O4 ultrathin films sandwiched between Al2O3 spacer layers in a quantum confined geometry. At the two-dimensional crossover, polarized neutron reflectometry reveals an anomalous enhancement of the total magnetization compared to the bulk value. Synchrotron X-ray magnetic circular dichroism measurements demonstrate the appearance of a long-range ferromagnetic ordering of spins on both Co and Cr sublattices. Brillouin function analyses and ab-initio density functional theory calculations further corroborate that the observed phenomena are due to the strongly altered magnetic frustration invoked by quantum confinement effects, manifested by the onset of a Yafet-Kittel-type ordering as the magnetic ground state in the ultrathin limit, which is unattainable in the bulk.

引用

页码：8381 / 8387

页数：7

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