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Direct Evidence of Simultaneous Reversal of Ferrimagnetically Coupled Sm 4f and Mn 3d Angular Momenta in SmMnO3
J.-S. Jung1, T. Nakamura2, Y. Wakabayashi3, T. Kimura4
1MLCC Materials Development Group, Samsung Electro-Mechanics, Suwon 16674, Korea
2Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
3Department of Physics, Tohoku University, Sendai, Miyagi 980-8578, Japan
4Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan

A Néel N-type ferrimagnet, SmMnO3, exhibits a striking magnetocapacitive effect around the compensation temperature. To clarify the origin of the magnetocapacitive effect, the magnetic states of the Sm 4f and the Mn 3d moments in SmMnO3 were investigated by means of X-ray magnetic circular dichroism (XMCD). The information on the Sm 4f and the Mn 3d magnetic states were obtained by using soft X-rays for the Sm M4,5 and the Mn L2,3 edges, respectively. Our soft XMCD data directly demonstrate that the magnetocapacitive effect of SmMnO3 is induced by simultaneous reversals of Sm 4f and Mn 3d angular momenta.

J. Korean Phys. Soc. 2020; 76: 904-910  https://doi.org/10.3938/jkps.76.904
Bend-Insensitive Simultaneous Measurement of Strain and Temperature based on Cascaded Long-Period Fiber Gratings Inscribed on a Polarization-Maintaining Photonic Crystal Fiber
Do Kyung Kim1, Seul-Lee Lee1, Sungwook Choi1, Min Seok Kim1, Jihoon Kim2, Jinsil Han2, Yong Wook Lee1,2
1Interdisciplinary Program of Biomedical Mechanical & Electrical Engineering, Pukyong National University, Busan 48513, Korea
2School of Electrical Engineering, Pukyong National University, Busan 48513, Korea
(a) Schematic diagram of the fabrication setup for cascaded long-period fiber gratings (LPFGs) on polarization-maintaining photonic crystal fiber (PMPCF), (b) side-view image of the fabricated grating, and (c) its polarization-dependent in-
fiber Mach-Zehnder interference spectra measured for orthogonal input polarization states denoted by polarizer angles of 0° (red) and 90° (blue). The inset of (b) shows a cross-sectional image of the PMPCF. SIDs A and B are the two fringe dips used as sensor indicators. (d) Schematic diagram of the proposed sensor and wavelength shifts of SIDs A (red) and B (blue), measured for applied (e) strain and (f) temperature changes.
J. Korean Phys. Soc. 2020; 76: 810-818  https://doi.org/10.3938/jkps.76.810
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