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Author: robert shull

Displaying records 31 to 40 of 65 records.
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31. Peak Magnetocaloric Effects in Al-Gd-Fe Alloys
Published: 6/1/2004
Authors: Virgil Provenzano, Alexander J. Shapiro, T T King, E R Canavan, P Shirron, M J DiPirro, Robert D Shull
Abstract: The magnetocaloric properties of several AlxGdyFez (with x+y+z=100) ternary alloys have been determined between 2-300 K. Three distinct peaks in the magnetic entropy change Sm vs T were found: a low temperature peak (near 10 K), an intermediate t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853308

32. Magnetic Properties of a High Energy Ball-Milled Amorphous Gd_{5}Si_{1.8}Ge_{1.8}Sn_{0.4} Alloy
Published: 5/14/2004
Authors: Tiebang Zhang, Virgil Provenzano, Robert D Shull, Y. G. Chen
Abstract: Amorphous Gd_{5}Si_{1.8}Ge_{1.8}Sn_{0.4} has been obtained with the help of a high-energy ball milling technique. XRD and DSC measurements confirm the amorphous nature of the milled alloy. The separation of FC and ZFC curves below the ferromagnetic t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854071

33. Modeling of Magnetization and Demagnetization in Magnetic Regenerative Refrigeration
Published: 1/2/2004
Authors: F Shir, Edward Della Torre, Lawrence Herman Bennett, C Mavriplis, Robert D Shull
Abstract: A time-dependent model of magnetization and demagnetization temperature profile is developed based on thermodynamic and heat transfer laws, material properties, and variable-field magnet parameters. Test results of a magnetic refrigeration test bed o ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853309

34. Flux Loss Measurements of Ag- Sheathed Bi-2223 Tapes
Published: 1/1/2004
Authors: Mi-Hye Jang, Winnie K Wong-Ng, Robert D Shull, Lawrence P. Cook, DeaSik Suh
Abstract: Alternating current (AC) losses of two Bi-2223 ([Bi, Pb] : Sr : Ca : Cu :O = 2:2:2:3) tapes [one untwisted (Tape I, twist-pitch of mm) and the other with a twist-pitch of 8mm (Tape II)] were measured and compared. These samples, produced by the powd ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850790

35. Enhanced Magnetocaloric Effects in R^d3^(Ga^d1-x^Fe^dx^)^d5^O^d12^ (R=Gd, Dy, Ho; 0
Published: 10/1/2003
Authors: Virgil Provenzano, J Li, T T King, E R Canavan, P Shirron, M J DiPirro, Robert D Shull
Abstract: A series of R^d3^(Ga1-xFex)5O12 (R=Gd, Dy, Ho; 0 ...

http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853193

36. Experimental Verification of Interactions Between Randomly Distributed Fine Magnetic Particles
Published: 10/1/2003
Authors: S Taketomi, Robert D Shull
Abstract: We experimentally examined whether or not a magnetic fluid (MF) is really superparamagnetic by comparing the initial magnetic susceptibilities of the mother MFs with those of their highly diluted solutions (more than 1000 times diluted) in which t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853276

37. Morphology of Yttrium-Iron Garnet Nanoparticles Dispersed Glass Composites.
Published: 5/15/2003
Authors: Alexander J. Shapiro, Robert D Shull
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901904

38. Nucleation and Evolution of Hybrid Spin Spiral in Soft/Hard Ferromagnetic Bilayer
Published: 5/1/2003
Authors: Yury P. Kabanov, V S Gornakov, Valerian Ivanovich Nikitenko, Alexander J. Shapiro, Robert D Shull
Abstract: The hybrid exchange spring behavior in a bilayer consisting of an epitaxial film of Fe (500 A)/Sm{u2^}Co{^u7^}(350 A) deposited onto a Cr(200 A) buffered MgO(110) substrate was investigated using the magneto-optical indicator film technique. Two c ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853194

39. Room Temperature Active Regenerative Magnetic Refrigeration: Magnetic Nanocomposites
Published: 5/1/2003
Authors: F Shir, L Yanik, Lawrence Herman Bennett, Edward Della Torre, Robert D Shull
Abstract: Nanocomposites have several advantages as a refrigerant for 100 -300 K applications, compared to the other common methods of assembling a magnetic refrigeration bed, such as a layered arrangement of the thermal bed or mixing of different magnetic mat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853210

40. Stationary Antiferromagnetic Domains During Magnetization Reversal in an Exchange-Biased FeMn/Fe76Mn6C18 Bilayer
Published: 5/1/2003
Authors: Robert D Shull, Alexander J. Shapiro, V S Gornakov, Valerian Ivanovich Nikitenko, H W Zhao
Abstract: Domain processes were observed at 300K using the magneto-optic indicator film technique (MOIF) in an exchange-coupled ferromagnet (FM)/antiferromagnet (AF) bilayer Fe76MN6C18 (150 )/FeMn (100 ) deposited under the presence of a 0.4 mT magnetic fiel ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853197



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