• 제목/요약/키워드: resonant x-ray scattering

검색결과 12건 처리시간 0.021초

엑스선 공명 자기 산란을 이용한 자성 다층박막 및 나노 구조체의 자기 구조와 자기 스위칭 메커니즘의 연구 (X-Ray Resonant Magnetic Scattering Study of Magnetic Structures and Magnetic Switching Mechanism in Magnetic Multilayers and Nanostructures)

  • 이동렬
    • 한국자기학회지
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    • 제20권4호
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    • pp.160-166
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    • 2010

  • 엑스선 공명 자기산란은 엑스선 반사율과 회절의 원리를 이용하여 자기 다층박막 내 깊이 방향의 자화 모양 및 자기 나노 구조체 내의 자화 분포를 특정 원소별로 구할 수 있다. 여기서는 엑스선 공명 자기산란에 대한 간단한 설명과 이를 이용한 자성 다층박막 및 나노 구조체의 자기 구조와 자기 스위칭의 연구에 대하여 몇 가지 예를 들어 설명하려 한다.

  • https://doi.org/10.4283/JKMS.2010.20.4.160 인용 PDF KSCI

X-ray scattering study on the electric field-induced interfacial magnetic anisotropy modulation at CoFeB / MgO interfaces

  • Song, Kyung Mee;Kim, Dong-Ok;Kim, Jae-Sung;Lee, Dong Ryeol;Choi, Jun Woo
    • Current Applied Physics
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    • 제18권11호
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    • pp.1212-1217
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    • 2018

  • The electric field-induced modifications of magnetic anisotropy in CoFeB/MgO systems are studied using X-ray resonant magnetic scattering and magneto-optical Kerr effect. Voltage dependent changes of the magnetic anisotropy of -12.7 fJ/Vm and -8.32 fJ/Vm are observed for Ta/CoFeB/MgO and Hf/CoFeB/MgO systems, respectively. This implies that the interfacial perpendicular magnetic anisotropy is reduced (enhanced) when electron density is increased (decreased). X-ray resonant magnetic scattering measurements reveal that the small in-plane magnetic component of the remanent state of CoFeB/MgO systems with weak magnetic anisotropy changes depending on the applied voltage leading to modification of the magnetic anisotropy at the CoFeB/MgO interface.

  • https://doi.org/10.1016/j.cap.2018.05.003 인용 KSCI

Resonant inelastic X-ray scattering of tantalum double perovskite structures

  • Oh, Ju Hyun;Kim, Jung Ho;Jeong, Jung Hyun;Chang, Seo Hyoung
    • Current Applied Physics
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    • 제18권11호
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    • pp.1225-1229
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    • 2018

  • In this paper, we investigated the electronic structures and defect states of $SrLaMgTaO_6$ (SLMTO) double perovskite structures by using resonant inelastic x-ray scattering. Recently, $Eu^{3+}$ doped SLMTO red phosphors have been vigorously investigated due to their higher red emission efficiency compared to commercial white light emitting diodes (W-LED). However, a comprehensive understanding on the electronic structures and defect states of host SLMTO compounds, which are specifically related to the W-LED and photoluminescence (PL), is far from complete. Here, we found that the PL spectra of SLMTO powder compounds sintered at a higher temperature, $1400^{\circ}C$, were weaker in the blue emission regions (at around 400 nm) and became enhanced in near infrared (NIR) regions compared to those sintered at $1200^{\circ}C$. To elucidate the difference of the PL spectra, we performed resonant inelastic x-ray spectroscopy (RIXS) at Ta L-edge. Our RIXS result implies that the microscopic origin of different PL spectra is not relevant to the Ta-related defects and oxygen vacancies.

  • https://doi.org/10.1016/j.cap.2018.05.014 인용 KSCI

Understanding spin configuration in the geometrically frustrated magnet TbB4: A resonant soft X-ray scattering study

  • Huang, H.;Jang, H.;Kang, B.Y.;Cho, B.K.;Kao, C.C.;Liu, Y.J.;Lee, J.S.
    • Current Applied Physics
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    • 제18권11호
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    • pp.1205-1211
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    • 2018

  • The frustrated magnet has been regarded as a system that could be a promising host material for the quantum spin liquid (QSL). However, it is difficult to determine the spin configuration and the corresponding mechanism in this system, because of its geometrical frustration (i.e., crystal structure and symmetry). Herein, we systematically investigate one of the geometrically frustrated magnets, the $TbB_4$ compound. Using resonant soft x-ray scattering (RSXS), we explored its spin configuration, as well as Tb's quadrupole. Comprehensive evaluations of the temperature and photon energy/polarization dependences of the RSXS signals reveal the mechanism of spin reorientation upon cooling down, which is the sophisticated interplay between the Tb spin and the crystal symmetry rather than its orbit (quadrupole). Our results and their implications would further shed a light on the search for possible realization of QSL.

  • https://doi.org/10.1016/j.cap.2018.05.005 인용 KSCI