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You searched on: Author: robert shull

Displaying records 61 to 70 of 81 records.
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61. Rotational Hysteresis of Exchange-Spring Magnets
Published: 9/13/2002
Authors: J.S. Jiang, S D Bader, H Kaper, G Leaf, Robert D Shull, Alexander J. Shapiro, V S. Gornakov, Valerian Ivanovich Nikitenko, C L Platt, A. E. Berkowitz, S David, E E Fullerton
Abstract: We highlight our experimental studies and micromagnetic simulations of the rotational hysteresis in exchange-spring magnets. Magneto-optical imaging and torque magnetometry measurements for SmCo/Fe exchange-spring films with uniaxial in-plane ani ...

62. Dynamic Antiferromagnetic Spin Structure and Domains in Exchange Coupled Multilayers.
Published: 9/2/2002
Authors: Valerian Ivanovich Nikitenko, Alexander J. Shapiro, Robert D Shull

63. Formation and Stabilization of Nanosize Grains in Ferromagnetic Thin Films by Dispersed C^d60^
Published: 7/1/2002
Authors: L A Zheng, E V Barrera, Robert D Shull
Abstract: A self-assembly grain growth model is proposed to explain the recent observation of the formation of the uniform columnar nanosize grain structures in the ferromagnetic metal-C^d60^ thin films. Calculations of the grain size based on this model comp ...

64. Anomalous Switching Behavior of Antiparallel-Coupled CO Layers Separated by a Super-Thin Ru Spacer
Published: 5/15/2002
Authors: V S. Gornakov, Valerian Ivanovich Nikitenko, William F. Egelhoff Jr., Robert D McMichael, Alexander J. Shapiro, Robert D Shull
Abstract: The details of the magnetization reversal mechanisms upon field reversal in coupled ferromagnetic CO (2.5 nm)/Ru(0.5 nm)/Co (2.6 nm) trilayers deposited on obliquely sputtered Ta (10.6 nm) underlayers were studied using the magneto-optical indicator ...

65. Magnetic Behavior of Yttrium-Iron-Garnet Nanoparticles Dispersed in Glass Composites
Published: 5/15/2002
Authors: S Taketomi, Robert D Shull
Abstract: By absorbing amorphous yttrium iron garnet (YIG) nanoparticles into nanosized pores of a controlled pore glass (CPG) followed by heat treatment, we synthesized YIG nanocrystal-dispersed glass composites. In a sample which was prepared with CPG of 30 ...

66. Experimental Study of Magnetic Interactions Between Colloidal Particles in Magnetic Fluids
Published: 5/1/2002
Authors: S Taketomi, Robert D Shull
Abstract: In order to clarify whether or not there is any magnetic interaction between the magnetic colloidal particles in magnetic fluids (MF's), we compare the magnetization curve of a mother MF with that of a 1000-fold diluted solution. For a MF which show ...

67. Multi-Step Magnetic Switching in Single-Crystal (001) Co^d2^MnGe Films
Published: 4/23/2002
Authors: F Y Yang, C H Shang, T Ambrose, J J Krebs, G A Prinz, Valerian Ivanovich Nikitenko, V S. Gornakov, Alexander J. Shapiro, Robert D Shull, C L Chien
Abstract: Multi-step magnetic switching with single, double, and triple loops has been observed in single-crystal (001) Co2MnGe Heusler alloy films epitaxially grown on GaAs (001) substrates due to a combined magnetic anisotropy consisting of cubic magnetocr ...

68. Rare-Earth Garnets and Perovskites for Space-Based ADR Cooling at High T and Low H
Published: 3/1/2002
Authors: T T King, B A Rowlett, R A Ramirez, E R Canavan, M J DiPirro, J S Panek, J G Tuttle, Robert D Shull, R A. Fry
Abstract: Future NASA satellite detector systems must be cooled to the 0.1K temperature range to meet the stringent energy resolution and sensitivity requirements demanded by mid-term astronomy missions. The development of adiabatic demagnetization refrigerat ...

69. Direct Experimental Study of the Exchange Spring Formation Process
Published: 2/7/2002
Authors: V S. Gornakov, Valerian Ivanovich Nikitenko, Alexander J. Shapiro, Robert D Shull

70. Features of Domain Nucleation and Growth in Co/Ru/Co Synthetic Antiferromagnets Deposited on Obliquely Sputtered Ta Underlayers
Published: 2/1/2002
Authors: Alexander J. Shapiro, V S. Gornakov, Valerian Ivanovich Nikitenko, Robert D McMichael, William F. Egelhoff Jr., Y W Tahk, Robert D Shull, L Gan
Abstract: Obliquely sputtered Ta underlayers were used to stabilize antiferromagnetically couple Co/Ru/Co/Ta structures with a strong uniaxial anistropy. Magneto-optical indicator film (MOIF) imaging revealed nucleation and growth of domains during remagnetiz ...

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