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You searched on: Author: robert shull

Displaying records 31 to 40 of 81 records.
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31. Asymmetrical Domain Nucleation and Unusual Magnetization Reversal of Ultrathin Co Films and Co/Pt Multilayers With Perpendicular Anisotropy
Published: 3/16/2007
Authors: Yu L Iunin, Yury P. Kabanov, Valerian Ivanovich Nikitenko, X M Cheng, Alexander J. Shapiro, Robert D Shull, C L Chien
Abstract: The features of magnetization reversal in Pt/[CO/Pt]_{n}/Pt multilayers (n = 1, 2, 4) have been studied using magneto-optical Kerr microscopy. Asymmetric nucleation centers were revealed where domains form at different positions for up or down magne ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853486

32. National Nanotechnology Initiative Interagency Workshop on Instrumentation and Metrology for Nanotechnology Grand Challenge Report
Published: 8/1/2006
Authors: Michael T Postek, Richard R Cavanagh, C M Allocca, Douglas T Smith, Robert D Shull, David A Wollman, David G Seiler, Stephen Knight, A Diebold, Richard M Silver, Charles W Clark, Kevin W Lyons, James R Whetstone, Ronald F Boisvert
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=822247

33. Thermal Neutron Demagnetization of NdFeB Magnets
Published: 7/30/2006
Authors: R Klaffky, Richard Mark Lindstrom, Brian B. Maranville, Robert D Shull, B Micklich, J Vacca
Abstract: To isolate the effect that thermal neutrons have on Nd2Fe14B permanent magnets, the magnetization and coercivity were studied as a function of dose. The changes in remanent magnetization are substantial and are attributed to boron thermal neutron ca ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853450

34. Amorphous FeCoCrZrB Ferromagnets for Use as High-Temperature Magnetic Refrigerants
Published: 4/27/2006
Authors: Freemon Johnson, Robert D Shull
Abstract: Magnetic metallic glasses, having large magnetic moments and high Curie Temperatures (TC), have not been widely studied as magnetic refrigerants. In this study, we report on the magnetocaloric effects of five FeCoCrZrB amorphous alloys ((FexCoyCrz)91 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853403

35. The Effects of Small Metal Additions (Co, Cu, Ga, Mn, Al, Bi, Sn) on the Magnetocaloric Properties of the Gd^d5^Ge^d2^Si^d2^ Alloy
Published: 4/26/2006
Authors: Robert D Shull, Virgil Provenzano, Alexander J. Shapiro, A Fu, M W Lufaso, E Karapetrova, G Kletetschka, V Mikula
Abstract: It was shown that adding one atomic percent Fe to Gd5Ge2Si2 greatly reduced its large hysteresis losses, broadened the magnetic entropy change, ?Sm, versus temperature, T, peak, and shifted the ?Sm peak value from 275 K to 305 K[1]. The present pape ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853414

36. Unusual Magnetization Reversal in [Co/Pt]4 Multilayers With Perpendicular Anisotropy
Published: 4/21/2006
Authors: X M Cheng, Valerian Ivanovich Nikitenko, Alexander J. Shapiro, Robert D Shull, C L Chien
Abstract: Unusual magnetization reversal of [Co(4 )/Pt(10 )]4 multilayers with perpendicular magnetic anisotropy has been revealed macroscopically by magnetometry measurements and microscopically by magneto-optical Kerr effect (MOKE) microscopy and magnetic fo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853410

37. Structure and Magnetocaloric Properties of the Fe-Doped HoTiGe Alloy
Published: 4/20/2006
Authors: Virgil Provenzano, B Baumgold, Robert D Shull, Alexander J. Shapiro, Keiichi Koyama, Kazuo Watanabe, N K Singh, K G Suresh, A K Nigam, S K Malik
Abstract: The structure and magnetocaloric properties of the Fe-doped HoTiGe compound were investigated by means of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), x-ray diffraction (XRD), superconducting quantum interference device ( ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853409

38. Magnetic Fluids' Phase Transition Between Micelle and Mono-Dispersed Phases
Published: 4/18/2006
Authors: S Taketomi, R V Drew, Robert D Shull
Abstract: A very stably dispersed magnetic fluid (Mother MF) and its 1000-times diluted solution were independently zero-field-cooled from room temperature to 5 K followed by application of a magnetic field of 2.86 MA/m for 300 seconds. After the field was ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853330

39. Performance of Electret Ionization Chambers in Magnetic Field
Published: 4/7/2006
Authors: P Kotrappa, L R Stieff, Timothy F Mengers, Robert D McMichael, Robert D Shull
Abstract: Electret Ionization Chambers (EIC) are widely used for measuring radon and radiation. The radiation measured includes alpha, beta and gamma radiation. These detectors do not have any electronics and as such can be introduced into magnetic field regi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853384

40. High Field X-Ray Diffraction Studies on Gd^d5^(Ge^d2-x^Fe^dx^)Si^d2^ (x = 0.05 and 0.2)
Published: 9/15/2005
Authors: Jim Long Her, Keiichi Koyama, Kazuo Watanabe, Virgil Provenzano, F Fu, Robert D Shull
Abstract: We performed the X-ray diffraction measurements in magnetic fields up to 5 T for Gd5(Ge1.95Fe0.05)Si2 and Gd5(Ge1.8Fe0.2)Si2 which are noted recently as related materials for magnetic refrigerants. With heating from 8 K, the matrix of Gd5(Ge1.95Fe0.0 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853392



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