Extreme anti-reflection enhanced magneto-optic Kerr effect microscopy

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Magnetic and spintronic media have offered fundamental scientific subjects and technological applications. Magneto-optic Kerr effect (MOKE) microscopy provides the most accessible platform to study the dynamics of spins, magnetic quasi-particles, and domain walls. However, in the research of nanoscale spin textures and state-of-the-art spintronic devices, optical techniques are generally restricted by the extremely weak magneto-optical activity and diffraction limit. Highly sophisticated, expensive electron microscopy and scanning probe methods thus have come to the forefront. Here, we show that extreme anti-reflection (EAR) dramatically improves the performance and functionality of MOKE microscopy. For 1-nm-thin Co film, we demonstrate a Kerr amplitude as large as 20 degrees and magnetic domain imaging visibility of 0.47. Especially, EAR-enhanced MOKE microscopy enables real-time detection and statistical analysis of sub-wavelength magnetic domain reversals. Furthermore, we exploit enhanced magneto-optic birefringence and demonstrate analyser-free MOKE microscopy. The EAR technique is promising for optical investigations and applications of nanomagnetic systems. Magneto-optic Kerr effect microscopy is useful for dynamic magnetic studies, but is limited by the weak magneto-optical activity. Here, the authors show that extreme anti-reflection result in a Kerr amplitude as large as 20 degrees and enables real-time detection of sub-wavelength magnetic domain reversals.
Publisher
NATURE RESEARCH
Issue Date
2020-11
Language
English
Article Type
Article
Citation

NATURE COMMUNICATIONS, v.11, no.1

ISSN
2041-1723
DOI
10.1038/s41467-020-19724-7
URI
http://hdl.handle.net/10203/279161
Appears in Collection
MS-Journal Papers(저널논문)PH-Journal Papers(저널논문)
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