U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications by: Brian Kirby (Fed)

Search Title, Abstract, Conference, Citation, Keyword or Author
Displaying 26 - 50 of 184

Differentiation between Strain and Charge Mediated Magnetoelectric Coupling in La 0.7 Sr 0.3 MnO 3 /Pb(Mg 1/3 Nb 2/3) d0.7^Ti 0.3 O 3 (001)

June 17, 2020
Author(s)
T. Bhatnagar-Schoffmann, Emmanuel Kentzinger, A. Sarkar, P. Schoffmann, Q. Lan, L. Jin, A. Kovacs, Alexander Grutter, Brian Kirby, R. Beerwerth, M. Waschk, Annika Stellhorn, U. Rucker, R. E. Dunin-Borkowski, Th. Bruckel
Magnetoelectric (ME) coupling in La 0.7Sr 0.3MnO 3/Pb(Mg 1/3Nb 2/3)d0.7^Ti 0.3O 3 (LSMO/PMN-PT (001)) has been probed in the past years to identify the underlying mechanism behind it. PMN-PT, which is well known for its excellent piezoelectric properties

Correlating Magnetic Structure and Magnetotransport in Semimetal Thin Films of Eu 1-x Sm x TiO 3

May 15, 2020
Author(s)
Zach Porter, Ryan F. Need, Kaveh Ahadi, Yang Zhao, Zhijun Xu, Brian Kirby, Jeffrey W. Lynn, Susanne Stemmer, Stephen D. Wilson
We report on the evolution of the average and depth-dependent magnetic order in thin film samples of biaxially stressed and electron-doped EuTiO 3 for samples across a doping range 20 cm −3. Under an applied in-plane magnetic field, the G-type

Magnetic Properties and Electronic Origin of the Interface between Dilute Magnetic Semiconductors with Orthogonal Magnetic Anisotropy

May 15, 2020
Author(s)
Ryan F. Need, Seul-Ki Bac, Xinyu Liu, Sanghoon Lee, Brian Kirby, Margaret Dobrowolska, Jacek Kossut, Jacek K. Furdyna
Controlling changes in magnetic anisotropy across epitaxial film interfaces is an important prerequisite for many spintronic devices. For the canonical dilute magnetic semiconductor GaMnAs, magnetic anisotropy is highly tunable through strain and doping

Impact of Growth Kinetics on the Interface Morphology and Magnetization in La 1/3 Sr 2/3 FeO 3 /La 2/3 Sr 1/3 MnO 3 Heterostructures

April 17, 2020
Author(s)
M. Waschk, A. Sarkar, J. Barthel, J. Voigt, S. Schroder, P. Zakalek, M. Schmitz, Brian Kirby, S. Putter, J. Schubert, T. Bruckel
The ability to create atomically perfect, epitaxial heterostructures of correlated complex perovskite oxides using state-of-art thin film deposition techniques has generated new physical phenomena at engineered interfaces. Here we report on the impact of

Correlation-Driven Eightfold Magnetic Anisotropy in a Two-Dimensional Oxide Monolayer

April 10, 2020
Author(s)
Zhangzhang Cui, Alexander Grutter, Hua Zhou, Hui Cao, Yongqi Dong, Dustin A. Gilbert, Jingyuan Wang, Yi-Sheng Liu, Jiaji Ma, Zhenpeng Hu, Jinghua Guo, Jing Xia, Brian Kirby, Padraic Shafer, Elke Arenholz, Hanghui Chen, Xiaofang Zhai, Yalin Lu
Engineering magnetic anisotropy (MA) in two-dimensional (2D) ferromagnetic materials has enormous scientific and technological implications. The uniaxial anisotropy universally exhibited by 2D ferromagnetic materials has only two stable spin directions

Strain-Induced Majority Carrier Inversion in Ferromagnetic Epitaxial LaCoO^d3-d Thin Films

March 4, 2020
Author(s)
Vipul Chaturvedi, Jeff Walter, Arpita Paul, Alexander Grutter, Brian Kirby, Jong Seok Jeong, Hua Zhou, Zhan Zhang, Biqiong Yu, Martin Greven, K. Andre Mkhoyan, Turan Birol, Chris Leighton
Tensile-strained LaCoO 3-δ thin films are ferromagnetic, in sharp contrast to the zero-spin bulk, although no clear consensus has emerged as to the origin of this phenomenon. While magnetism has been heavily studied, relatively little attention has been

Dysprosium Iron Garnet Thin Films with Perpendicular Magnetic Anisotropy on Silicon

January 1, 2020
Author(s)
Jackson J. Bauer, Ethan R. Rosenberg, Subhajit Kundu, K. Andre Mkhoyan, Patrick Quarterman, Alexander Grutter, Brian Kirby, Julie Borchers, Caroline A. Ross
Magnetic insulators, such as the rare-earth iron garnets, are promising materials for energy-efficient spintronic memory and logic devices, and their anisotropy, magnetization and other properties can be tuned over a wide range through selection of the

Emergent Magnetic State in (111)-Oriented Quasi-Two-Dimensional Spinel Oxides

December 11, 2019
Author(s)
Xiaoran Liu, Sobhit Singh, Brian Kirby, Zhicheng Zhong, Yanwei Cao, Banabir Pal, Mikhail Kareev, Srimanta Middey, John W. Freeland, Padraic Shafer, Elke Arenholz, David Vanderbilt, Jak Chakhalian
We report on the emergent magnetic state of (111)-oriented CoCr 2O 4 ultrathin films sandwiched by Al 2O 3 in the quantum confined geometry. At the two-dimensional crossover, polarized neutron reflectometry reveals an anomalous enhancement of the total

Spin Seebeck Imaging of Spin-Torque Switching in Antiferromagnetic Pt/NiO Heterostructures

October 22, 2019
Author(s)
Isaiah Gray, Takahiro Moriyama, Nikhil Sivadas, Gregory M. Stiehl, John T. Heron, Ryan F. Need, Brian Kirby, David H. Low, Katja Nowack, Darrell G. Schlom, Daniel C. Ralph, Teruo Ono, Gregory D. Fuchs
We demonstrate the spin Seebeck microscope as a sensitive method for imaging in-plane antiferromagnetic order in thin films. Recently, antidamping spin-orbit torques have been used to reorient Neel order in antiferromagnetic devices. Although the readout

Using Structural Phase Transitions to Enhance the Coercivity of Ferromagnetic Films

October 17, 2019
Author(s)
Ryan F Need, Josh Lauzier, Logan Sutton, Brian J Kirby, Jose de la Venta
Storing information in magnetic recording technologies requires careful optimization of the recording media's magnetic properties. For example, heat-assisted magnetic recording (HAMR) relies on a pre-recording heating step that momentarily lowers the

Ultrathin Interfacial Layer with Suppressed Room Temperature Magnetization in Magnesium Aluminum Ferrite Thin Films

September 24, 2019
Author(s)
Jacob J. Wisser, Satoru Emori, Lauren Riddiford, Aaron Altman, Peng Li, Krishnamurthy Mahalingam, Brittany T. Urwin, Brandon M. Howe, Michael R. Page, Alexander Grutter, Brian Kirby, Yuri Suzuki
Low-damping magnetic oxide thin films with small thicknesses are essential for efficient insulator spintronic devices, particularly those driven by spin torques effects. Here, we investigate depth-resolved compositional and magnetic properties of epitaxial