• Title/Summary/Keyword: spin

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Spin-Wave Interference

  • Choi Sang-Kook;Lee Ki-Suk;Kim Sang-Koog
    • Proceedings of the Korean Magnestics Society Conference
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    • 2006.06a
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    • pp.106-107
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    • 2006

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A New Fast Spin Echo MR Imaging Technique for the Simultaneous Dual Echo Image Acquisition (Dual Echo 영상의 동시 획득을 위한 새로운 Fast Spin Echo 자기 공명 영상법)

  • 조민형;이수열
    • Journal of Biomedical Engineering Research
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    • v.19 no.1
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    • pp.91-100
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    • 1998

  • In magnetic resonance imaging, the fast spin echo imaging technique is a widely used clinical imaging method. since its scanning time is much shorter than the conventional spin echo imaging and it gives the almost same image quality. However, the fast spin echo technique has two times longer imaging time for the dual echo acquisition which can obtain a spin density image and a T-give the same qulity images at the single echo imaging time. T he proposed technique reduces the imaging time by overlapping most of were obtained at the 0.3T permanent MRI system are presented.

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Spin Transport in a Ferromagnet/Semiconductor/Ferromagnet Structure: a Spin Transistor

  • Lee, W.Y;Bland, J.A.C
    • Journal of Magnetics
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    • v.7 no.1
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    • pp.4-8
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    • 2002

  • The magnetoresistance (MR) and the magnetization reversal of a lateral spin-injection device based on a spin-polarized field effect transistor (spin FET) have been investigated. The device consists of a two-dimensional electron gas (2DEG) system in an InAs single quantum well (SQW) and two ferromagnetic $(Ni_{80}Fe_{20})$ contacts: all injector (source) and a detector (drain). Spin-polarized electrons are injected from the first contact and, after propagating through the InAs SQW are collected by the second contact. By engineering the shape of the permalloy contacts, we were able to observe distinct switching fields $(H_c)$ from the injector and the collector by using scanning Kerr microscopy and MR measurements. Magneto-optic Kerr effect (MOKE) hysteresis loops demonstrate that there is a range of magnetic field (20~60 Oe), at room temperature, over which the magnetization in one contact is aligned antiparallel to that in the other. The MOKE results are consistent with the variation of the magnetoresistance in the spin-injection device.

  • https://doi.org/10.4283/JMAG.2002.7.1.004 인용 PDF KSCI