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- 주제어 : magnetic dipole interaction (검색결과 3 건)
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하지층 Cr의 스퍼터링 압력을 달리하여 제작한 Cr/CoSm/Cr 자성막의 자기상호작용이 자기역전부피에 끼치는 영향
권해웅(Hae-Woong Kwon),정순영(Soon Young Jeong),김현수(Hyeon Soo Kim) 한국자기학회 2018 韓國磁氣學會誌 Vol.28 No.6
Magnetic interaction effects on the magnetic switching volume for Cr/CoSm/Cr magnetic films deposited with different sputtering pressures (7~10 mTorr) of underlayer (Cr) was investigated. The magnetic interaction mechanism of all the Cr/CoSm/Cr magnetic films investigated in this study was dipole interaction, and the dipole interaction was stronger at the samples fabricated at low sputtering pressure. The magnetic field (H<SUB>ΔM</SUB>) at which the maximum dipole interaction occurred in each sample was larger than the coercivity (H<SUB>c</SUB>). The magnetic switching volume was larger for the sample with stronger dipole interaction, and it showed maximum value in the H<SUB>ΔM</SUB> region and then decreased in higher field region above the H<SUB>ΔM</SUB>. Therefore, it is considered that the intensity of the dipole interaction is closely related to the magnetic switching volume.
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Mohsen Janipour,Farrokh Hodjat-Kashani 한국광학회 2014 Current Optics and Photonics Vol.18 No.6
The mechanism of optical interaction of two nanoholes, milled in an opaque gold film, by means of surface plasmon polariton (SPP) propagation is investigated. The interaction depends on the polarization direction of the incident light when the nanohole pair is illuminated through uniform single antenna excitations. It is shown that by illuminating one of the nanoholes, under single antenna excitation, the other nanohole can be excited indirectly via propagated SPPs from the excited nanohole. In addition, it is found that the spectrum of electromagnetic power above the surface of the metallic film at an arbitrary point along the axis of the nanohole pair presents two resonant peaks. These peaks are due to the optical interaction between nanoholes, where the short- and long-wavelength peaks can be assigned to in-phase and antiphase interactions of magnetic dipoles relative to each nanohole, respectively. The magnetic coupled dipole approximation (MCDA) method confirms the simulation results.
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Fe0.9Zn0.1Cr₂S₄의 결정학적 및 자기적 성질에 관한 연구
배성환(Sung Hwan Bae),김삼진(Sam Jin Kim),김철성(Chul Sung Kim) 한국자기학회 2007 韓國磁氣學會誌 Vol.17 No.1
Fe0.9Zn0.1Cr₂S₄ 를 직접합성법으로 제조하여 X-선 회절기(XRD), 진동 시료 자화율 측정기(VSM), Mössbauer 분광기를 이용하여 시료의 결정학적 및 자기적 특성을 연구하였다. X-선 회절도 분석 결과, 결정구조는 입방정형 스피넬 구조이며, 공간 그룹은 Fd3m으로 격자 상수는 a₀ = 9.9967 Å로 결정되었다. 100 Oe 인가자장하의 자화 곡선(ZFC: Zero field cooling)에서는 77 K 근방에서 첨점 형태의 특이 현상이 관측되었다. VSM과 Mössbauer 스펙트럼 분석 결과 Néel 온도(TN)는 153 K로 결정되었다. Mössbauer 스펙트럼은 4.2 K에서 커다란 전기 사중극자 상호작용에 의한 비대칭적인 8-line 형태를 나타내었으며 이때의 전기 사중극자 분열치는 2.22 ㎜/s이었다. 77 K에서 전기 사중극자 분열치는 0.20 ㎜/s로 급격히 감소하였고 온도 상승과 함께 Mössbauer 스펙트럼 또한 8-line에서 6-line 형태로 변하였다. 상온에서의 이성질체 이동 값은 0.48 ㎜/s로 철의 이온 상태가 전온도 영역에서 Fe2+로 결정되어 진다. The crystallographic and magnetic properties of Fe0.9Zn0.1Cr₂S₄ have been studied by X-ray diffractometer (XRD), vibrating sample magnetometer (VSM) and Mössbauer spectroscopy measurement. The crystal structure was determined by the normal cubic spinel of space group Fd3m and the lattice constant was a₀ = 9.9967 Å. The specific phenomenon which looks like cusp pattern at 77 K was observed in magnetization curves (ZFC : Zero Field Cooling) under 100 Oe applied field. Neél temperature (TN) was determined to be 153 K by VSM and Mössbauer spectra. The asymmetric 8-line profile has been observed at 4.2 K, which was attributed by the colossal electric quadrupole interaction (∆EQ), ∆EQ has 2.22 ㎜/s at 4.2 K. The ∆EQ abruptly decreases around 77 K and then it disappears above 77 K with diminishing of 8-line pattern. The isomer shift δ at room temperature is 0.48 ㎜/s relative to Fe metal, which means that the charge state of Fe ions is ferrous in character.
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