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You searched on: Author: Robert Shull

Displaying records 1 to 10 of 81 records.
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1. Underlayer Effect on Perpendicular Magnetic Anisotropy in Co(sub20)Fe(sub60)B(sub20)/MgO
Published: 7/1/2016
Authors: Andrew Peijie Chen, Yury Y. Iunin, S F Cheng, Robert D Shull
Abstract: Perpendicular Magnetic Tunneling Junctions (pMTJs) with Ta\CoFeB\MgO have been extensively studied in recent years. However, the effects of the underlayer on the formation of the CoFeB perpendicular magnetic anisotropy (PMA) are still not well under ...

2. Shape critical properties of patterned Permalloy thin films
Published: 12/7/2015
Authors: Robert D Shull, Y. P. Kabanov, V S Gornakov, Andrew Peijie Chen, Valerian Ivanovich Nikitenko
Abstract: The effects of shape and edges in magnetic elements with reduced dimensions on the magnetization reversal of cross- and framed cross- shaped Ni(sub79)Fe(sub21) (30mn) films were studied. Remagnetization details in the stripes of the patterned struct ...

3. Magnetocaloric Response Of Non-Stoichiometric Ni(sub2)MnGa Alloys and the Influence of Texture
Published: 11/1/2015
Authors: Michael V. McLeod, Anit Giri, Brigitte Anne Paterson, Cindi L Dennis, H L Zhou, S C Vogel, Yong Ho Sohn, Robert D Shull, B S Majumdar
Abstract: Currently, there is significant interest in magnetocaloric materials for solid state refrigeration. In this work, polycrystalline Heusler alloys belonging to the Ni(sub2+x)Mn(sub 1-x) Ga family, with x between 0.08 and 0.24, were evaluated for the p ...

4. Gd(sub 90)Co(sub 2.5)Fe(sub 7.5) Alloy Displaying Enhanced magnetocaloric Properties
Published: 7/3/2015
Authors: Virgil Provenzano, Robert D Shull, G Kletetschka, Paul E Stutzman
Abstract: Because of its attractive magnetocaloric properties, gadolinium (Gd) metal is currently the refrigerant of choice in the development of near-room temperature magnetic cooling prototypes (refrigerators, heat pumps, and air conditioners). The overwhelm ...

5. Details of the Magnetization Reversal in Patterned Exchange-biased and Unbiased Thin Films
Published: 11/1/2014
Authors: Robert D Shull, Y. P. Kabanov, Andrew Peijie Chen, Cindi L Dennis, V S Gornakov, Valerian I. Nikitenko
Abstract: New features of the magnetization reversal of a patterned bilayer in the form of a square mesh consisting of 16 um wide intersecting stripes of Ni(sub79)Fe(sub21) (30 nm) exchange-coupled with IrMn (10 um) on top were revealed via use of the advanced ...

6. International comparison of measurements of hard magnets with the Vibrating Sample Magnetometer
Published: 8/1/2014
Authors: F. Fiorillo, C. Beatrice, D. Son, Franz Josef Ahlers, R. Groessinger, F. Albertini, Y. P. Liu, A Lin, E. Patroi, Robert D Shull, O. Thomas
Abstract: We present the results of an international comparison regarding the magnetic properties of hard magnets, measured using the Vibrating Sample Magnetometer. The comparison involved eight different international laboratories, plus two laboratories usi ...

7. Radiation Studies of Spin-transfer Torque Materials and Devices
Published: 8/15/2013
Authors: H. L. Hughes, Konrad Bussmann, Shu-Fan Cheng, Robert D Shull, Andrew Peijie Chen, S. Schafer, T. Mewes, A. Ong, E. NMN Chen
Abstract: Spin-transfer torque film stacks and devices having in-plane magnetization were irradiated using a cobalt-60 gamma source. The film stacks have a biased, synthetic antiferromagnet spin-valve architecture. Measurements of magnetization vs. field, fe ...

8. Use of Half Metallic Heusler Alloys in CoFeB/MgO/Heusler Alloy Tunnel Junctions
Published: 7/15/2013
Authors: Andrew Peijie Chen, Gen G. Feng, Robert D Shull
Abstract: Heusler Alloys Co(sub2)FeSi and Co(sub2)MnSi were deposited on both single crystal MgO (100) and polycrystalline SiO(Sub2) silicon thermal oxide substrates and characterized by x-ray diffraction before and after thermal annealing at various tempe ...

9. Direct Experimental Study of the Effect of Dislocations on the Magnetization Reversal in a Quasi-Two- Dimensional Ferromagnet with Unidirectional Anisotropy
Published: 5/15/2013
Authors: V S. Gornakov, Valerian Ivanovich Nikitenko, I. V. Shashkov, M. A. Lebyodkin, Robert D Shull
Abstract: The effect of dislocations on the elementary acts of the magnetization reversal in the epitaxial heterostructure NiFe/NiO/MgO(001) has been studied using the magneto-optical indicator film technique. It has been found that the edge dislocations ...

10. Effect of crystallographic alignment on the magnetocaloric effect in alloys near the Ni(sub2)MnGa stoichiometry
Published: 5/1/2013
Authors: A K Giri, Brigitte Anne Paterson, Michael V. McLeod, Cindi L Dennis, B S Majumdar, Kyu C. Cho, Robert D Shull
Abstract: Prior to the development of commercial applications of magnetic refrigerator technology, a large magnetocaloric effect (MCE) in polycrystalline materials must be realized for relatively low magnetic field changes. In this context, a crystallographic ...

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