Signatures of Fluctuation-Driven Magnetic Topological Charge in Pt-Ferromagnetic Insulator Bilayers

Chiral magnetic textures are of fundamental interest for studying exotic spin behavior, but also promising for the development of energy-efficient memory and logic devices. Recent computational work has suggested that in contrast to well-studied static chiral textures like skyrmions, there exists dynamic fluctuation-driven magnetic chirality even in the absence of long-range magnetic order. Here, we present definitive magnetotransport signatures of fluctuation-driven chirality in a model material system of Pt/Li_{0.5}Al_{1.0}Fe_{1.5}O_{4} (LAFO) bilayers, where LAFO is a ferromagnetic insulator. We establish a fluctuation-driven origin for the magnetic chirality by observing a strong correlation between the onset of the topological Hall effect and the destruction of magnetic order. Corroborated by Monte Carlo simulations, we develop a rigorous analytical framework to gain a first-principles understanding of scaling behaviors in the transport data. Our results bring novel insights to fluctuation-driven chirality and analysis of magnetotransport data.

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Publication Details

Journal
Physical Review Letters
Published
2025-07-14
DOI
https://doi.org/10.1103/r5pw-sqk2
Primary Topic
Magnetic properties of thin films
Type
article
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article

Signatures of Fluctuation-Driven Magnetic Topological Charge in Pt-Ferromagnetic Insulator Bilayers

Zbigniew Galazka, Yuntian Li, Jiadong Zang, Houssam Sabri et al.
Physical Review Letters
Magnetic properties of thin films
article

Signatures of Fluctuation-Driven Magnetic Topological Charge in Pt-Ferromagnetic Insulator Bilayers

Zbigniew Galazka, Yuntian Li, Jiadong Zang, Houssam Sabri, Xin Yu Zheng, I. R. Fisher, Haowen Ren, Andrew D. Kent, Y. Suzuki, Xia Hong, Tian-Yue Chen, Kun Wang, Qiuchen Wu, Karl J. Friston
article en

Abstract

Chiral magnetic textures are of fundamental interest for studying exotic spin behavior, but also promising for the development of energy-efficient memory and logic devices. Recent computational work has suggested that in contrast to well-studied static chiral textures like skyrmions, there exists dynamic fluctuation-driven magnetic chirality even in the absence of long-range magnetic order. Here, we present definitive magnetotransport signatures of fluctuation-driven chirality in a model material system of Pt/Li_{0.5}Al_{1.0}Fe_{1.5}O_{4} (LAFO) bilayers, where LAFO is a ferromagnetic insulator. We establish a fluctuation-driven origin for the magnetic chirality by observing a strong correlation between the onset of the topological Hall effect and the destruction of magnetic order. Corroborated by Monte Carlo simulations, we develop a rigorous analytical framework to gain a first-principles understanding of scaling behaviors in the transport data. Our results bring novel insights to fluctuation-driven chirality and analysis of magnetotransport data.

Physical Review LettersVol. 135(9)
University of Nebraska–Lincoln (US), University of New Hampshire (US), University of New Hampshire at Manchester (US), Airway Technologies (United States) (US), Applied StemCell (United States) (US), New York University (US), Leibniz Institute for Crystal Growth (DE), Stanford University (US)
Openalex Percentile: Top 87%
Magnetic properties of thin films
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