Ji-Wan Kim

Kunsan National University

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Jaewoo Jeong

Korea Advanced Institute of Science and Technology

Sung‐Chul Shin

Pusan National University

Kyeong‐Dong Lee

Korea Advanced Institute of Science and Technology

Yooleemi Shin

Kunsan National University

Hyon-Seok Song

Daegu Gyeongbuk Institute of Science and Technology

Chun‐Yeol You

Daegu Gyeongbuk Institute of Science and Technology

M. Vomir

Université de Strasbourg

J.‐Y. Bigot

Institut de Physique et Chimie des Matériaux de Strasbourg

Jong‐Ryul Jeong

Chungnam National University

Jeong-Woo Sohn

Catholic Kwandong University

Cooperative Institutions

Chinese Academy of Sciences

Korea Advanced Institute of Science and Technology

University of Chinese Academy of Sciences

Seoul National University

Institute of Automation

Chungnam National University

Centre National de la Recherche Scientifique

Pohang University of Science and Technology

National University of Defense Technology

Chungbuk National University

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Extraordinary Enhancement of Magneto-Optical Faraday Rotation Angle in Bi-Yig/Pt/Glass Prepared by Metal Organic Decomposition Method

Viet Dongquoc Phuoc Cao Van Rambabu Kuchi Trinh Nguyen Thi Duc Duong Viet

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Magneto

Faraday cage

10.2139/ssrn.4791042

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Ferromagnetic Magnetization Reversal of Exchange-Biased NiFe/FeMn/CoFe Trilayers

한국자기학회 학술연구발표회 논문개요집 (2008)

Ki‐Yeon Kim Hyeok-Chul Choi Ji-Wan Kim Sung‐Chul Shin Chun‐Yeol You

Magnetization reversal

Exchange bias

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Interlayer-Coupled Ferromagnetic Reversal Mediated by Antiferromagnetic Layer in Py/FeMn/CoFe Heterostructures

한국자기학회 학술연구발표회 논문개요집 (2010)

Ki‐Yeon Kim Ji-Wan Kim Hyeok-Cheol Choi A. Teichert Chun‐Yeol You

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Femtosecond pump-probe MOKE microscopy for an ultrafast spin dynamics study

Journal of the Korean Physical Society (2006)

Kyeong‐Dong Lee Ji-Wan Kim Jaewoo Jeong Dong‐Hyun Kim Sung‐Chul Shin

Christian ministry

Basic Research

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Magneto-optical Kerr effect measurement in ultrafast Sagnac interferometry using the Jones matrix approach

Optics Letters (2021)

Yooleemi Shin Ji-Wan Kim

We report the Jones matrix formalism of the magneto-optic Kerr effect (MOKE) for ferromagnets using an ultrafast Sagnac interferometer. Compared to the time-resolved MOKE instrument, the Sagnac interferometer has the advantage of obtaining the real and imaginary parts of the differential MOKE signal as well as the differential reflectivity and the lattice displacement at the same time. In addition, a simple method to obtain the static values of Kerr rotation and ellipticity is presented.

Magneto-optic Kerr effect

Sagnac effect

10.1364/ol.429988

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Relaxation effects of magnetization modulus and precession axis on damping time of precession in L1 0 -ordered FePt alloy film

Current Applied Physics (2017)

Ji-Wan Kim Hyon-Seok Song Chun‐Yeol You Sung‐Chul Shin

Precession

Larmor precession

Magnetization dynamics

10.1016/j.cap.2017.01.016

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Extraordinary enhancement of magneto-optical Faraday rotation angle in Bi-YIG/Pt/glass prepared by metal organic decomposition method

Surfaces and Interfaces (2024)

Viet Dongquoc Phuoc Cao Van Rambabu Kuchi Trinh Nguyen Thi Duc Duong Viet

Yttrium Iron Garnet

Bismuth

Diffractometer

10.1016/j.surfin.2024.104652

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Magnetoelasticity-driven phase inversion of ultrafast spin precession in NixFe100-x thin films

arXiv (Cornell University) (2022)

Yooleemi Shin Seong-soo Yoon Jung‐Il Hong Ji-Wan Kim

We present strong evidences for the deterministic role of magnetoelasticity in ultrafast spin dynamics of ferromagnetic NixFe100-x alloy films. Without a change in the crystal structure, we observed sudden Pi-phase inversion of the spin precession in the range of x = 87.0 - 97.5. In addition, it was found that the phase was continuously changed and reversed its sign by varying the pump fluence. These cannot be explained simply by temperature dependence of magnetocrystalline, demagnetizing, and Zeeman fields which have been conventionally considered so far in describing the spin dynamics. Through the temperature- and composition-dependent simulations adding the magnetoelastic field generated from the lattice thermal strain, we revealed that the conventional and magnetoelastic fields were competing around x = 95.3, where the spin dynamics showed the largest phase shift. For analytic understanding, we further show that the temperature-dependent interplay of the Curie temperature, saturation magnetization, and magnetostriction, which are demonstrated to be the most important macroscopic parameters, determines the ultrafast spin dynamics. Our extensive study emphasizes that magnetoelasticity is the key ingredient for fully understanding the driving mechanism of ultrafast spin dynamics.

Magnetization dynamics

Spin wave

10.48550/arxiv.2212.11852

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Ultrafast Magnetization Dynamics of MgO/FePdB Multilayer

Jeong-Woo Sohn Ji-Wan Kim Kyeong Dong Lee Hyon-Seok Song Gyung‐Min Choi

Magnetization dynamics

Dynamics

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Dephasing in photoinduced large-angle spin precession of confined ferromagnetic structures

Physical Review B (2010)

Kyeong-Dong Lee Kwang‐Su Ryu Ji-Wan Kim Hyon-Seok Song Jaewoo Jeong

Spin precessions in the stripes of $\ensuremath{\alpha}\text{-MnAs}$ films prepared on GaAs(001) are investigated using an all-optical pump-probe method. We find that a large-angle spin precession appears while the stripe width decreases. In addition, the large-angle precession considerably changes the resonance frequency, resulting in a significant decrease in the relaxation time. These changes in the precessional motion are mainly ascribed to the dephasing of the nonuniform spin waves existing at the large-angle precession, as experimentally confirmed by varying the precession angle via tuning pump fluence. Micromagnetic simulations using a single Gilbert damping constant well predict the experimental observations, which verifies the interpretation of the change in the precessional motion.

Dephasing

Precession

Larmor precession

10.1103/physrevb.82.140401

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Citations (7)