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Search Publications by: Robert D. Shull (Assoc)

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Displaying 1 - 25 of 188

Magnetoelastic effects in doubly clamped electroplated CoFe micro-beam resonators

March 12, 2019
Author(s)
Margo Staruch, S. P. Bennett, B. R. Matis, J. W. Baldwin, K. Bussmann, Daniel Gopman, Yury Kabanov, June W. Lau, Robert D. Shull, E. Langlois, C. Arrington, J. R. Pillars, Peter Finkel
Magnetostrictive Co77Fe23 films were fabricated on silicon wafers and fully suspended to produce free-standing, doubly clamped, micro-beam resonators. A negative or positive shift in the resonant frequency was observed for magnetic fields applied parallel

Electric-field control of perpendicular magnetic anisotropy in multiferroic PZT- and PMN- PT//[Co/Ni] composites with negative magnetostriction

July 4, 2018
Author(s)
Daniel B. Gopman, Andrew P. Chen, Cindi L. Dennis, June W. Lau, Robert D. Shull, Gregory P. Carman, Peter Finkel, Margo Staruch, Andres Chavez
A longstanding goal of spintronics is to identify alternatives to current-generated Oersted- fields for magnetization control at the nanoscale. An emerging approach seeks to harness the voltage-induced strain in a proximal piezostrictive layer to modify

Zero-field current switching of magnetic domains via chiral domain walls

March 16, 2018
Author(s)
Yufan Li, Qinli Ma, Daniel Gopman, Yury Kabanov, Robert D. Shull, C Chien
In ferromagnetic (FM) materials, the inherent exchange interaction, magnetic anisotropy, & dipolar forces dictate the domain walls (DWs), Bloch or N´eel, that separate magnetic moments. However, in FM thin films in contact with heavy metal (HM) with strong

Large magneto-optical Kerr effect and real-time imaging of magnetic domain in an antiferromagnet

January 26, 2018
Author(s)
Daniel B. Gopman, Robert D. Shull, Yury Kabanov, Huiyan Man, L. Wu, O.M.J. van 't Erve, D. Rees, Yufan Li, S. Pantakar, C L. Chien, J Orenstein, Tomoya Higo, Satoru Nakatsuji
When a linearly polarized light beam is incident upon the surface of a magnetic material, the reflected light becomes elliptically polarized and the ellipse major axes undergo a polar rotation within the polarization plane of the incident light: this

Electric-Field Induced Reversible Switching of the Magnetic Easy Axis in Co/BiFeO 3 on SrTiO 3

April 18, 2017
Author(s)
Tieren Gao, Xiaohang Zhang, William D. Ratcliff, Shingo Maruyama, Makoto Murakami, Anbusathaiah Varatharajan, Zahra Yamani, Peijie Chen, Ke Wang, Huairuo Zhang, Robert D. Shull, Leonid A. Bendersky, John Unguris, R. Ramesh, Ramamoorthy Ramesh, I. Takeuchi
We demonstrate reversible electric-field-induced switching of the magnetic state of the Co layer in Co/BiFeO 3 (BFO) (001) thin film heterostructures fabricated on (001) SrTiO 3 substrates. The angular dependence of the coercivity and the remanent

Manipulation of magnetic anisotropy through linear piezoelectric response in magnetoelectric heterostructures

November 21, 2016
Author(s)
Daniel B. Gopman, Robert D. Shull, Yury Y. Iunin, Margo Staruch, Shu-Fan Cheng, Konrad Bussmann, Peter Finkel
The ability to tune both magnetic and electric properties concomitantly in magnetoelectric (ME) composite heterostructures coupled through interfacial strain is crucial for multiple transduction applications including energy harvesting or magnetic field

Influence of internal geometry on magnetization reversal in asymmetric permalloy rings

August 28, 2016
Author(s)
Daniel B. Gopman, Yury Kabanov, Robert D. Shull, Jizhai Cui, Christopher Lynch
We report the magnetization reversal behavior of microstructured $\mathrm{Ni_{80}Fe_{20}}$ rings using magneto-optic indicator film imaging and magnetometry. While the reversal behavior of rings with a symmetric (circular) interior hole agree with

Effect of Grain Constraint on the Field Requirements for Magnetocaloric Effect in Ni(sub45)Co(Sub5)Mn(Sub40)Sn(sub10) Melt-Spun Ribbons

August 21, 2016
Author(s)
N. M. Bruno, Y. J. Huang, Cindi L. Dennis, J. G. Li, Robert D. Shull, J. H. Ross Jr., Y. I. Chumlyakov, I. Karaman
The influence of grain constraint on the magnetic field levels required to complete the isothermal martensitic transformation in magnetic shape memory alloys has been demonstrated for a NiCoMnSn alloy and the magnetocaloric performance of an optimally heat