• Title/Summary/Keyword: Magnetic materials

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Simultaneous regulation of photoabsorption and ferromagnetism of NaTaO3 by Fe doping

  • Yang, Huan;Zhang, Liguo;Yu, Lifang;Wang, Fang;Ma, Zhenzhen;Zhou, Jie;Xu, Xiaohong
    • Current Applied Physics
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    • v.18 no.11
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    • pp.1422-1425
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    • 2018

  • $NaTa_{1-x}Fe_xO_3$ ($0{\leq}x{\leq}0.40$) nanocubes were synthesized by a relatively low temperature hydrothermal method, using $Ta_2O_5$, $FeCl_3$ and NaOH as the precursors. The UV-vis diffuse reflectance spectra showed that $NaTa_{1-x}Fe_xO_3$ had significant visible-light-absorbing capability, and the absorption edge of $NaTaO_3$ shifted to longer wavelength with the increase of Fe dopants. Moreover, $NaTa_{1-x}Fe_xO_3$ exhibited room-temperature ferromagnetism when $Fe^{3+}$ occupied $Ta^{5+}$ sites in $NaTaO_3$ crystal lattice. The ferromagnetism is mainly attributed to the superexchange interactions between doped $Fe^{3+}$, rather than the contribution of oxygen vacancies caused by Fe doping. Therefore, Fe doping can simultaneously regulate the optical and magnetic properties of $NaTaO_3$ semiconductor, which will enable its potential applications in multifunctional optical-electronics and opticalspintronics devices.

  • https://doi.org/10.1016/j.cap.2018.08.009 인용 KSCI

Magnetotransport of Be-doped GaMnAs (GaMnAs의 Be 병행 도핑에 의한 자기 수송 특성 연구)

  • Im W. S.;Yoon T. S.;Yu F. C.;Gao C. X.;Kim D. J.;Ibm Y. E.;Kim H. J.;Kim C. S.;Kim C. O.
    • Korean Journal of Materials Research
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    • v.15 no.1
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    • pp.73-77
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    • 2005

  • Motivated by the enhanced magnetic properties of Mg-codoped GaMnN ferromagnetic semiconductors, Be-codoped GaMnAs films were grown via molecular beam epitaxy with varying Mn flux at a fixed Be flux. The structural, electrical, and magnetic properties were investigated. GaAs:(Mn,Be) films showed metallic behavior while GaAs:Mn films showed semiconducting behavior as determined by the temperature dependent resistivity measurements. The Hall-effect measurements with varying magnetic field showed clear anomalous Hall effect up to room temperature proving ferromagnetism and magnetotransport in the GaAs:(Mn,Be) films. Planar Hall resistance measurement also confirmed the properties. The dramatic enhancement of the Curie temperature in GaMnAs system was attributed to Be codoping in the GaMnAs films as well as MnAs precipitation.

  • https://doi.org/10.3740/MRSK.2005.15.1.073 인용 PDF KSCI

Recent Advances in Soft Magnetic Actuators and Sensors using Magnetic Particles (자성 분말 기반 소프트 자성 액츄에이터 및 센서 연구 동향)

  • Song, Hyeonseo;Lee, Hajun;Kim, Junghyo;Kim, Jiyun
    • Journal of Powder Materials
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    • v.28 no.6
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    • pp.509-517
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    • 2021

  • Smart materials capable of changing their characteristics in response to stimuli such as light, heat, pH, and electric and magnetic fields are promising for application to flexible electronics, soft robotics, and biomedicine. Compared with conventional rigid materials, these materials are typically composed of soft materials that improve the biocompatibility and allow for large and dynamic deformations in response to external environmental stimuli. Among them, smart magnetic materials are attracting immense attention owing to their fast response, remote actuation, and wide penetration range under various conditions. In this review, we report the material design and fabrication of smart magnetic materials. Furthermore, we focus on recent advances in their typical applications, namely, soft magnetic actuators, sensors for self-assembly, object manipulation, shape transformation, multimodal robot actuation, and tactile sensing.

  • https://doi.org/10.4150/KPMI.2021.28.6.509 인용 PDF KSCI