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Author: robert shull

Displaying records 21 to 30 of 65 records.
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21. 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

22. 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

23. 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

24. Details of the Sequential Steps in Magnetocaloric Regeneration
Published: 6/8/2005
Authors: F Shir, Lawrence Herman Bennett, Edward Della Torre, C Mavriplis, L Yanik, Robert D Shull
Abstract: We report on the first demonstration of the four sequential steps in magnetocaloric regeneration of a magnetocaloric material: magnetization, warm blow, demagnetization, and cold blow. The experimental results display temperature divergence due to re ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853315

25. Magnetic Properties of the Co-C{d60} and Fe-C{d60}Nanocrystalline Magnetic Thin Films
Published: 4/21/2005
Authors: L A Zheng, E V Barrera, Robert D Shull
Abstract: The basic magnetic properties of Co-C{d60} and Fe-C{d60} nanocrystalline magnetic thin films and the temperature effects of these properties have been investigated. Experimental results show that the Co-C{d60} films possess an in-plane magnetic anis ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853238

26. Anomalous Magnetic Aftereffect of a Frozen Magnetic Fluid
Published: 1/1/2005
Authors: S Taketomi, R V Drew, Robert D Shull
Abstract: A very stably dispersed magnetic fluid (MF) was zero-field-cooled from room temperature of 5 K followed by the application of a magnetic field of 2.86 MA/m for 300 seconds. After the field was removed (t = 0), its residual magnetization M was measur ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853301

27. Antisymmetric Magnetoresistance in Magnetic Multilayers With Perpendicular Anisotropy
Published: 1/1/2005
Authors: X M Cheng, Sergei Urazhdin, T Tchernyshyov, C L Chien, Valerian Ivanovich Nikitenko, Alexander J. Shapiro, Robert D Shull
Abstract: While magnetoresistance (MR) has generally been found to be symmetric in applied field H in non-magnetic or magnetic metals, we have observed antisymmetric MR in Co/Pt multilayers. Simultaneous domain imaging and transport measurements show that the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853372

28. Near Elimination of Large Hystersis Losses in the Gd5Ge2S12 Magnetic Refrigerant Compound by a Small Alloying Addition of Iron.
Published: 6/24/2004
Authors: Virgil Provenzano, Alexander J. Shapiro, Robert D Shull
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901914

29. Reduction of Large Hysteresis Losses in the Gd^d5^uGe^d2^uSi^d2^u Magnetic Refrigerant Compound by a Small Alloying Addition of Iron
Published: 6/24/2004
Authors: Virgil Provenzano, Alexander J. Shapiro, Robert D Shull
Abstract: This paper describes the discovery of an effective and straightforward method for reducing (by more than 90 percent) the large hysteresis losses observed in the Gd5Ge2Si2 magnetic refrigerant compound in the 270 K-300 K temperature range. These are ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853321

30. Magneto-optic Indicator Film Observations of Domain Motion in Magnetostrictive Materials Under Stress
Published: 6/1/2004
Authors: Robert D Shull, E Quandt, Alexander J. Shapiro, S Glasmachers, M. Wuttig
Abstract: The magneto-optic indicator film (MOIF) technique was used to image the magnetic domain structure in a Tb40Fe60/Fe50Co50 multilayer as either a stress or a perpendicular magnetic field was applied to the material. These observations showed that the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853327



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