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Cao Van, Phuoc,Surabhi, Srivathsava,Dongquoc, Viet,Kuchi, Rambabu,Yoon, Soon-Gil,Jeong, Jong-Ryul Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.435 No.-
<P><B>Abstract</B></P> <P>We report high-quality yttrium–iron–garnet (YIG; Y<SUB>3</SUB>Fe<SUB>5</SUB>O<SUB>12</SUB>) ultrathin films grown on {111} gadolinium–gallium–garnet (GGG; Gd<SUB>3</SUB>Ga<SUB>5</SUB>O<SUB>12</SUB>) substrates using RF sputtering deposition on an off-stoichiometric target and optimized thermal treatments. We measured a narrow peak-to-peak ferromagnetic resonance linewidth (<I>∆H</I>) whose minimum value was 1.9 Oe at 9.43 GHz for a 60-nm-thick YIG film. This value is comparable to the most recently published value for a YIG thin film grown by pulsed laser deposition. The temperature dependence of the <I>∆H</I> was investigated systematically, the optimal annealing condition for our growing condition was 875 °C. Structural analysis revealed that surface roughness and crystallinity played an important role in the observed <I>∆H</I> broadening. Furthermore, the thickness dependence of the <I>∆H</I>, which indicated that 60 nm thickness was optimal to obtain narrow <I>∆H</I> YIG films, was also investigated. The thickness dependence of <I>∆H</I> was understood on the basis of contributions of surface-associated magnon scattering and magnetic inhomogeneities to the <I>∆H</I> broadening. Other techniques such as transmission electron microscopy, scanning electron microscopy, and X-ray diffraction were used to study the crystalline structure of the YIG films. The high quality of the films in terms of their magnetic properties was expressed through a very low coercivity and high saturation magnetization measured using a vibration sample magnetometer.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A high-quality YIG thin film with a FMR linewidth of 1.9Oe at 9.43GHz was grown by rf sputtering using an off-stoichiometric target. </LI> <LI> Precise control of surface morphology is crucial for improving the FMR characteristics of YIG films. </LI> <LI> The FMR linewidth investigation revealed the optimal annealing temperature for surface morphology and crystallinity development. </LI> <LI> Surface-associated magnon scattering and magnetic inhomogeneities contributed to the thickness dependence of the FMR linewidth. </LI> </UL> </P>
Phuoc Cao Van,Duc Duong Viet,Trinh Nguyen Thi,Ji-Hwan Seol,Gun-Woo Park,Jong-Ryul Jeong,Seung-Young Park,Churl Hee Cho 한국자기학회 2022 Journal of Magnetics Vol.27 No.1
In this study, spin Seebeck effect (SSE) signals caused by a thermal gradient induced by Joule and laser heating were examined. A Pt/Y₃Fe5O12/Gd₃Ga5O12 sample was used as the reference for SSE measurement. Both the Joule heating- and laser heating-based SSE measurement systems captured SSE hysteresis loops consistent with the magnetic hysteresis loop of the sample. The laser heating-based system measured a higher SSE signal; however, heat flux could not be precisely evaluated. With the Joule heating-based system, the spin Seebeck resistivity (SSR) was 21.2 ± 1 nm/A, comparable with the values obtained in other studies and indicating the feasibility of our apparatus for investigating SSE.
Broadband tunable plasmonic substrate using self-assembled gold–silver alloy nanoparticles
Phuoc Cao Van,Srivathsava Surabhi,Viet Dongquoc,이재웅,태청천,kuchirambabu,정종율 한국물리학회 2019 Current Applied Physics Vol.19 No.11
In the present work, a facile approach of Au–Ag alloy NPs fabrication is proposed for plasmonic inclusion applicative studies. These hybrid NPs were prepared by the sequential deposition of Ag, Au layers on a glass substrate via RF-sputtering followed by high-temperature annealing. Compositional and size controllability of the NPs was attained by changing the ratio of nominal thicknesses of the respective Au, and Ag layers during the deposition. LSPR red (blue) peak shift occurs with increasing layer thickness Au (Ag) signifying the peak sensitivity. The influence of geometrical, compositional, and background media for achieving LSPR-sensitivity is examined and validated by FDTD simulation studies. With the agreeable peak shift tendencies, the proposed study of broadband tunable LSPR-sensitivity is expected to provide a framework for a wide range of plasmonic applications.
Broadband tunable plasmonic substrate using self-assembled gold–silver alloy nanoparticles
Cao Van, Phuoc,Surabhi, Srivathsava,Quoc, Viet Dong,Lee, Jae Woong,Tae, Cheong Cheon,Kuchi, Rambabu,Jeong, Jong-Ryul Elsevier 2019 CURRENT APPLIED PHYSICS Vol.19 No.11
<P><B>Abstract</B></P> <P>In the present work, a facile approach of Au–Ag alloy NPs fabrication is proposed for plasmonic inclusion applicative studies. These hybrid NPs were prepared by the sequential deposition of Ag, Au layers on a glass substrate via RF-sputtering followed by high-temperature annealing. Compositional and size controllability of the NPs was attained by changing the ratio of nominal thicknesses of the respective Au, and Ag layers during the deposition. LSPR red (blue) peak shift occurs with increasing layer thickness Au (Ag) signifying the peak sensitivity. The influence of geometrical, compositional, and background media for achieving LSPR-sensitivity is examined and validated by FDTD simulation studies. With the agreeable peak shift tendencies, the proposed study of broadband tunable LSPR-sensitivity is expected to provide a framework for a wide range of plasmonic applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Facile approach of fabrication Au–Ag alloy NPs on glass is proposed. </LI> <LI> Effect of particle size and composition on LSPR sensitivity is studied. </LI> <LI> Results are compared with FDTD simulation under the influence of alloy permittivity. </LI> <LI> Effect of various background media on LSPR sensitivity has been investigated. </LI> <LI> This broadband tunable LSPR-based study is meant for diverse plasmonic applications. </LI> </UL> </P>