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Search Publications by: Brian Kirby (Fed)

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Displaying 76 - 96 of 96

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

Exchange Coupling in Magnetic Semiconductor Multilayers and Superlattices

May 1, 2012
Author(s)
J. K. Furdyna, J. Leiner, X. Liu, M. Dobrowolska, S. Lee, J.-H. Chung, Brian Kirby
The study of ferromagnetic semiconductors (FMSs) continues to be of great interest because of their potential for spintronic devices. While there has been much progress in our understanding of FMS materials ¿ particularly of the canonical III-V system Ga(1

Optimization of Spin-triplet Supercurrent in Ferromagnetic Josephson Junctions

March 20, 2012
Author(s)
Benjamin James McMorran, Theresa Ginley, Julie Borchers, Brian Kirby, Brian B. Maranville, John Unguris
In the past year, several groups have observed evidence for long-range spin-triplet, supercurrent in Josephson junctions containing ferromagnetic (F) materials. In our work, the spin-triplet pair correlations are created by non-collinear magnetizations

X-ray and Neutron Reflectivity and Electronic Properties of PCBM-poly(bromo)styrene Blends and Bilayers with Poly(3-hexylthiophene)

March 1, 2012
Author(s)
Stuart B. Kirschner, Nathaniel P. Smith, Kevin A. Wepasnick, Howard E. Katz, Brian Kirby, Julie Borchers, Daniel H. Reich
We used neutron reflectivity to complement x-ray reflectivity characterization of PCMB-based layers formed on poly(3-hexylthiophene) (P3HT). Single-layer analyses were used to provide reliable scattering length density values for bilayer fitting. Atomic

Phase-Sensitive Specular Neutron Reflectometry for Imaging the Nanometer Scale Compositional Depth profile of Thin-Film Materials

November 20, 2011
Author(s)
Brian Kirby, Paul A. Kienzle, Brian B. Maranville, Norman F. Berk, J. Krycka, Frank Heinrich, Charles Majkrzak
Neutron reflectometry is a powerful method for probing the molecular scale structure of both hard and soft condensed matter films. Moreover, the phase-sensitive methods which have been developed make it possible for specular neutron reflectometry to be

Structural Properties of Bi 2 Te 3 and Bi 2 Se 3 Topological Insulators Grown by Molecular Beam Epitaxy on GaAs(001) Substrates

October 24, 2011
Author(s)
X. Liu, D. J. Smith, J. Fan, Y.-H. Zhang, H. Cao, Y. P. Chen, J. Leiner, Brian Kirby, M. Dobrowolska, J. K. Furdyna
Thin films of Bi 2Te 3 and Bi 2Se 3 have been grown on deoxidized GaAs(100) substrates using molecular beam epitaxy. Cross-sectional transmission electron microscopy established the highly parallel nature of the Bi-Te(Se)-Bi-Te(Se)-Bi quintuple layers

Helical Magnetic Order in MnSi Thin Films

August 22, 2011
Author(s)
E. A. Karhu, S. Kahwaji, M. D. Robertson, H. Fritzche, Brian Kirby, Charles Majkrzak, T. L. Monchesky
We present a study of the magnetic structure of crystalline MnSi(111) thin films by molecular beam epitaxy. A combination of polarized neutron diffraction (PNR) and SQUID magnetometry show that the films have helical magnetic order with a pitch vector Q

Investigation of Weak Interlayer Exchange Coupling in the GaMnAs/GaAs Superlattice with Insulating Nonmagnetic Spacers

July 1, 2011
Author(s)
Jae-Ho Chung, Young-Sang Song, Taehee Yoo, Sun-Jae Chung, Sanghoon Lee, Brian Kirby, X. Liu, J. K. Furdyna
A robust long-range antiferromagnetic coupling between ferromagnetic Ga 0.97Mn 0.03As layers has previously been realized via insertion of non-magnetic Be-doped GaAs spacers. In this paper, we report the observation of the weak antiferromagnetic coupling

Magnetization Reversal Mechanisms in Heusler Alloy Spin Valves

March 29, 2011
Author(s)
T. P. Ginley, Julie Borchers, Brian Kirby, Cindi L. Dennis, Matthew J. Carey, J. R. Childress
Ferromagnetic layers composed of Heusler alloys, which are predicted to be 100% spin polarized in bulk, have been incorporated into spin-valve sensors to improve performance. Transport studies of spin valves containing Co 2MnGe (CMG) in the free and pinned

Vertically Graded Anisotropy in Co/Pd Multilayers

March 8, 2010
Author(s)
Brian J. Kirby, Joseph E. Davies, Kai Liu, Shannon Watson, G. T. Zimanyi, Robert D. Shull, Paul A. Kienzle, Julie A. Borchers
It has been theoretically predicted that depth-grading the magnetic anisotropy in perpendicular magnetic media should reduce the field required to write data, without affecting the thermal stability. To study this prediction, we have produced a series of

Ferromagnetism in CuO-ZnO multilayers

July 28, 2008
Author(s)
C. Sudakar, K. Pradmanabhan, R Naik, G Lawes, Brian Kirby, Sanjiv Kumar, V. M. Naik
We investigated the magnetic properties of CuO–ZnO heterostructures to elucidate the origin of the ferromagnetic signature in Cu doped ZnO. The CuO and ZnO layer thickness were varied from 15 to 150 nm and from 70 to 350 nm⁠, respectively. Rutherford