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Search Publications by: Brian Kirby (Fed)

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Displaying 126 - 150 of 184

Realization of Ground-State Artificial Skyrmion Lattices at Room Temperature

October 8, 2015
Author(s)
Dustin A. Gilbert, Brian B. Maranville, Andy L. Balk, Brian J. Kirby, Peter Fischer, Daniel T. Pierce, John Unguris, Julie A. Borchers, Kai Liu
The topological nature of magnetic skyrmions deriving from broken symmetries leads to extraordinary static and dynamic properties that provide new insight in fundamental problems of magnetism and exciting potentials for exploitation in novel magnetic

Proximity-Driven Enhanced Magnetic Order at Ferromagnetic-Insulator-Magnetic-Topological Insulator Interface

August 17, 2015
Author(s)
Mingda Li, Cui-Zu Chang, Brian Kirby, Michelle E. Jamer, Wenping Cui, Lijun Wu, Peng Wei, Yimei Zhu, Don Heiman, Ju Li, Jagadeesh S. Moodera
Magnetic exchange driven proximity effect at a magnetic insulator/topological insulator (MI/TI) interface provides a rich playground for novel phenomena as well as a way to realize low energy dissipation quantum devices. Here we report a dramatic

Electric Field Control of Interfacial Ferromagnetism in CaMnO 3 /CaRuO 3 Heterostructures

July 24, 2015
Author(s)
Alexander J. Grutter, Brian J. Kirby, M. T. Gray, C. L. Flint, U. S. Alaan, Y. Suzuki, Julie A. Borchers
A key milestone for the development of low-power spintronic devices is electric field control of ferromagnetism. To that end, we have probed the electric field dependence of the emergent ferromagntic layer at CaRuO 3/CaMnO 3 interfaces in bilayers

Effective Anisotropy Gradient in Pressure Graded [Co/Pd] Multilayers

February 14, 2015
Author(s)
Brian J. Kirby, P. K. Greene, Brian B. Maranville, J. E. Davis, Kai Liu
A vertically graded anisotropy profile has been proposed as an optimized balance of low coercivity and thermal stability for multilayers used in magnetic media. Deposition pressure is known to have a profound effect on the magnetic reversal properties of

Interfacial Exchange Coupling in Fe/(Ga,Mn)As Bilayers

June 16, 2014
Author(s)
A. M. Alsmadi, Y. Choi, D.J. Keavney, K.F. Eid, Brian Kirby, X. Liu, J. Leiner, K. Tivakornsasithorn, M. Dobrowolska, J. K. Furdyna
We have carried out a systematical study of magnetic order and magnetic interlayer coupling in Fe/(Ga,Mn)As bilayers using superconducting quantum interference device magnetometry, polarized neutron reflectometry, element-specific x-ray absorption

Effect of Interfacial Octahedral Behavior in Ultrathin Manganite Films

May 14, 2014
Author(s)
E. J. Moon, P. V. Balachandran, Brian Kirby, D.J. Keavney, R.J. Sichel-Tissot, C. M. Schleputz, E. Karapetrova, X. M. Cheng, James M. Rondinelli, S. J. May
We investigate structural coupling of the MnO 6 octahedra across a film/substrate interface and the resultant changes of the physical properties of ultrathin La 2/3}Sr 1/3}MnO 3 (LSMO) films. In order to isolate the effect of interfacial MnO 6 octahedral

Structural and Magnetic Etch Damage in CoFeB

May 7, 2014
Author(s)
L. Krayer, June W. Lau, Brian Kirby
A detailed understanding of the interfacial properties of think films used in magnetic media is critical for the aggressive component scaling required for continued improvement in storage density. In particular, it is important to understand how common

Deposition Order Dependent Magnetization Reversal of Pressure Graded Co/Pd Films

April 15, 2014
Author(s)
P. K. Greene, Brian Kirby, June W. Lau, Julie Borchers, M .R. Fitzsimmons, Kai Liu
Magnetization reversal mechanisms have been investigated in pressure graded Co/Pd multilayer thin films with inverted deposition orders. Structural and magnetic properties have been investigated using x-ray diffraction, transmission electron microscopy

Interdependence Between Training and Magnetization Reversal in Granular Co-CoO Exchange Bias Systems

April 9, 2014
Author(s)
E. Menendez, T. Dias, J. Geshev, J. F. Lopez-Barbera, J. Nogues, R. Steitz, Brian Kirby, Julie Borchers, L.M.C. Pereira, A. Vantomme, K. Temst
The interdependence between training and magnetization reversal in granular Co-CoO exchange bias systems prepared by O ion implantation in Co thin films is demonstrated by polarized neutron reflectometry. The implantations result in rather uniform O depth

Magnetoelastic Coupling in La 0.7 Ca 0.3 MnO 3 /BaTiO 3 Ultrathin Films

October 11, 2013
Author(s)
A. Alberca, N. M. Nemes, F. J. Mompean, Titusz Feher, Ferenc Simon, J. Tornos, C. Leon, C. Munuera, Brian Kirby, M. R. Fitzsimmons, A. Hernando, J. Santamaria, M. Garcia-Hernandez
The magnetism of La 0.7Ca 0.3MnO 3 (LCMO) expitaxial thin films grown SrTi 3 (STO)and BaTiO 3 (BTO) substrates is studied using Polarized Neutron Reflectometry (PNR) and Ferromagnetic Resonance (FMR) techniques. PNR reveals a strongly suppressed

Structural Control of Magnetic Anisotropy in a Strain-Driven Multiferroic EuTiO 3 Thin Film

September 26, 2013
Author(s)
X. Ke, T. Birol, R. Misra, J.-H. Lee, Brian Kirby, D. G. Schlom, C.J. Fennie, J. W. Freeland
Octahedral distortion plays a key role in engineering physical properties of heterostructures of composed of perovskite oxides. We report on a strong in-plane uniaxial magnetic anisotropy in a strain-enabled multiferroic EuTiO 3 thin film epitaxially grown

Interfacial Ferromagnetism in LaNiO 3 /CaMnO 3 Superlattices

August 21, 2013
Author(s)
A. J. Grutter, H. Yang, Brian Kirby, M. R. Fitzsimmons, J. A. Aguiar, N. D. Browning, C. A. Jenkins, E. Arenholz, V. V. Mehta, U. S. Alaan, Y. Suzuki
We observe interfacial ferromagnetism in superlattices of the paramagnetic metal LaNiO 3 and the antiferromagnetic insulator CaMnO 3. The magnetic behavior can be explained in terms of an interfacial double exchange mechanism in which itinerant electrons

(001) FePt Graded Media with PtMn Underlayers

November 1, 2012
Author(s)
Chao-Chien Chiang, Wu-Chang Tsai, Liang-Wei Wang, Hao-Cheng Hou, Jung-Wei Liao, Hong-Ji Lin, Fan-Hsiu Chang, Brian Kirby, Chih-Huang Lai
(001)-oriented FePt graded media are obtained by using PtMn underlayers. The PtMn underlayer does not only behave as the (001) structural template, but provides the diffusion source of Mn. The diffusion of Mn into FePt reduces its anisotropy but, on the