• Title/Summary/Keyword: Magnetic device

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Performance Experiment of Electron Beam Convergence Instrument (Finishing 용 전자빔 집속 장치의 성능 실험)

  • Lim, Sun Jong
    • Laser Solutions
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    • v.18 no.3
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    • pp.6-8
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    • 2015

  • Finishing process includes deburring, polishing and edge radiusing. It improves the surface profile of specimen and eliminates the alien substance on surface. Deburring is the elimination process for debris of edges. Polishing lubricates surfaces by rubbing or chemical treatment. There are two types for electron finishing. The one is using pulse beam. The other is using the convergent and scanning electron beam. Pulse type device appropriates the large area process. But it does not control the beam dosage. Scanning type device has advantages for dosage control and edge deburring. We design the convergence and scan type. It has magnetic lenses for convergence and scan device for scanning beam. Magnetic lenses consist of convergent and objective lens. The lenses are designed by the specification(beam size and working distance). In this paper, we evaluate the convergence performance by pattern process. Also, we analysis the results and important factors for process. The important factors for process are beam size, pressure, stage speed and vacuum. These results will be utilized into systematizing pattern shape and the factors.

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Properties of Magnetic Resistance Device in Superconductor Materials (자기 저항소자의 특성)

  • Lee, Sang-Heon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2008.06a
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    • pp.283-284
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    • 2008

  • The magnetic flux is generated by a vortex current which circulates around the vortex with a sense of rotation opposite to that of the diamagnetic screening surface current. When the external magnetic field was applied to the superconductor magnetometer, some regions of the magnetic sensor will be destroyed, especially the weak link regions and the defect regions. The destroyed regions will be increased with the increasing of the magnetic flux.

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Magnetization reversal process of the nanosized elliptical permalloy magnetic dots with various aspect ratios

  • Lee, J. H.;K. H. Oh;Kim, K. Y.
    • Proceedings of the Korean Magnestics Society Conference
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    • 2002.12a
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    • pp.186-187
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    • 2002

  • Recently, there has been much interest in magnetic thin film patterned in submicron scale because of possible ultrahigh density storage media or logical device applications [1-3]. Various geometries such as rectangle, circle, ring and ellipse type dots have been studied to find the shape showing stable switching behavior from repeated cycles. However, rectangle and circle types may not be suitable for device applications because they have two uncontrollable different magnetization reversal modes: C state and S state, resulting in different coercivity and irreproducible switching[4]. (omitted)

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SPIN ENGINEERING OF FERROMAGNETIC FILMS VIA INVERSE PIEZOELECTRIC EFFECT

  • Lee, Jeong-Won;Shin, Sung-Chul;Kim, Sang-Koog
    • Proceedings of the Korean Magnestics Society Conference
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    • 2002.12a
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    • pp.188-189
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    • 2002

  • One of the current goals in memory device developments is to realize a nonvolatile memory, i.e., the stored information maintains even when the power is turned off. The representative candidates for nonvolatile memories are magnetic random access memory (MRAM) and ferroelectric random access memory (FRAM). In order to achieve a high density memory in MRAM device, the external magnetic field should be localized in a tiny cell to control the direction of spontaneous magnetization. (omitted)

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