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Higher harmonics in planar Hall effect induced by cluster magnetic multipoles
Jeongkeun Song1,2, Taekoo Oh1,2,3, Eun Kyo Ko1,2
1Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul, 08826, Korea.
Nature Communications
|October 31, 2022
Summary
Researchers used the planar Hall effect (PHE) to detect unique magnetic patterns, called cluster magnetic multipoles, in strained antiferromagnetic (AFM) materials. This breakthrough aids in understanding and utilizing AFM spintronics.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Antiferromagnetic (AFM) materials are crucial for spintronics and topological phenomena.
- Detecting spin configurations in AFM materials is challenging due to their lack of net magnetization.
Purpose of the Study:
- To demonstrate the use of the planar Hall effect (PHE) for detecting and distinguishing cluster magnetic multipoles in strained AFM Nd2Ir2O7 (NIO-227) films.
- To investigate the relationship between magnetic multipoles and PHE oscillations.
Main Methods:
- Inducing cluster magnetic multipoles (dipoles, A2- and T1-octupoles) via compressive strain in NIO-227 films.
- Measuring the planar Hall effect under magnetic field rotation.
Main Results:
- Distinct harmonic oscillations of PHE were observed for each magnetic multipole.
- Nonlinear magnetic field dependence of planar Hall conductivity was attributed to magnetic response of cluster magnetic octupoles.
Conclusions:
- The study presents a practical method for identifying cluster magnetic multipoles in AFM systems.
- This work promotes the development of octupole-based AFM spintronics.
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