Journal of the Korean Magneitcs Society, 30 Apr 2021, Vol.31 , No.2, pp.53-61
Cavity-FMR 장치를 이용한 강자성 재료의 물성 분석
We introduce the Cavity-FMR devices measuring the ferromagnetic resonance (FMR) signals, and phenomenological description of FMR signals measured in ferromagnetic thin films. The effective magnetization and g-factor can be obtained from the FMR field (
Journal of the Korean Magneitcs Society, 30 Apr 2021, Vol.31 , No.2, pp.62-68
극저온용 강자성 공명 측정 시스템 개발
The ferromagnetic resonance (FMR) including inverse spin hall effect (ISHE) by spin pumping is a useful method to analyze the spin dynamics of ferromagnetic material and the spin-charge conversion of ferromagnet/normal metal heterostructure. For localization of the ISHE-FMR system, we have developed a customizable ISHE-FMR system. The developed ISHE-FMR system can simultaneously measure the ISHE voltage and FMR signal in the various range of temperature (4~300 K). From this ISHE-FMR system, we measured the FMR derivative absorption signals and ISHE voltage of molecule-based ferromagnetic insulator (Cr-PBA,
Journal of the Korean Magneitcs Society, 30 Apr 2021, Vol.31 , No.2, pp.69-82
브릴루앙 광산란을 이용한 자성박막에서의 자화 동역학연구
Brillouin light scattering (BLS) is used to measure thermally exited surface and bulk spinwave (SW) modes in various magnetic materials and it is to study SW frequency ranges up to sub-hundred GHz. In this review, we discuss magnetic properties on magnetic thin films including Heisenberg interaction, in-plane biaxial magnetic anisotropy, perpendicular magnetic anisotropy, Dzyaloshinskii-Moriya interaction probed by using a BLS spectroscopy.
Journal of the Korean Magneitcs Society, 30 Apr 2021, Vol.31 , No.2, pp.83-89
Cu 전극 사이에 존재하는 항체 접합용 자성입자의 크기와 분포에 따른 자기저항 특성 연구
For the development of antibody therapeutics, magnetoresistance (MR) characteristics according to the size and distribution of superparamagnetic magnetic beads (MBs) and magnetic nanoparticles (MNPs), each with surfaces functionalized by silanol and carboxyl groups with magnetite (Fe3O4) cores, were investigated. Particles of different sizes were placed within a 1 mm space in the center of a plastic tank that could contain up to 10 μl in volume. A magnetic field was applied to the tank in order to distribute the particles. The minimum MR value, MR ratio, and solution coercivity obtained from the voltage curve, measured according to the strength of the external magnetic field passing through the MBs solution, were 3.567MΩ, 1.1%, and 400 Oe, respectively; for the MNPs solution, 0.245MΩ, 50%, and 184 Oe, respectively. The MNPs solution containing 0.35 μm sized particles showed a much more sensitive change in MR properties than the MB solution with 1 μm sized particles. This phenomenon was analyzed to have been caused by the estimated split distance (ESD) created by the movement of different sized magnetic particles and whether a large or small number of estimated degree of solution pathway (EDSP) were created in response to an external magnetic field. It was discussed that these characteristics could potentially be used to control the function of various biomolecules, including antibodies conjugated to the surface of MNPs.
Journal of the Korean Magneitcs Society, 30 Apr 2021, Vol.31 , No.2, pp.90-95
사각파 구동에 의한 평면홀 저항 센서의 출력 신호 향상
In PHR sensor, PHR signals