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Extreme anti-reflection enhanced magneto-optic Kerr effect microscopy.


ABSTRACT: 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° 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.

SUBMITTER: Kim D 

PROVIDER: S-EPMC7684307 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature

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Extreme anti-reflection enhanced magneto-optic Kerr effect microscopy.

Kim Dongha D   Oh Young-Wan YW   Kim Jong Uk JU   Lee Soogil S   Baucour Arthur A   Shin Jonghwa J   Kim Kab-Jin KJ   Park Byong-Guk BG   Seo Min-Kyo MK  

Nature communications 20201123 1


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, expens  ...[more]

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