You searched on: Author: Robert Shull
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1. Underlayer Effect on Perpendicular Magnetic Anisotropy in Co(sub20)Fe(sub60)B(sub20)/MgO
Andrew Peijie Chen, Yury Y. Iunin, S F Cheng, Robert D Shull
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
Robert D Shull, Y. P. Kabanov, V S Gornakov, Andrew Peijie Chen, Valerian Ivanovich Nikitenko
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
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
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
Virgil Provenzano, Robert D Shull, G Kletetschka, Paul E Stutzman
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
Robert D Shull, Y. P. Kabanov, Andrew Peijie Chen, Cindi L Dennis, V S Gornakov, Valerian I. Nikitenko
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
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
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
H. L. Hughes, Konrad Bussmann, Shu-Fan Cheng, Robert D Shull, Andrew Peijie Chen, S. Schafer, T. Mewes, A. Ong, E. NMN Chen
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
Andrew Peijie Chen, Gen G. Feng, Robert D Shull
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
V S. Gornakov, Valerian Ivanovich Nikitenko, I. V. Shashkov, M. A. Lebyodkin, Robert D Shull
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
A K Giri, Brigitte Anne Paterson, Michael V. McLeod, Cindi L Dennis, B S Majumdar, Kyu C. Cho, Robert D Shull
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 ...