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70 results on '"Heron, John T."'

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

Author

Gray, Isaiah, primary, Moriyama, Takahiro, additional, Sivadas, Nikhil, additional, Stiehl, Gregory M., additional, Heron, John T., additional, Need, Ryan, additional, Kirby, Brian J., additional, Low, David H., additional, Nowack, Katja C., additional, Schlom, Darrell G., additional, Ralph, Daniel C., additional, Ono, Teruo, additional, and Fuchs, Gregory D., additional

Published
2019
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56. Unexpected termination switching and polarity compensation in LaAlO ₃ /SrTiO ₃ heterostructures

Author

Singh-Bhalla, Guneeta, Rossen, Pim B., Pálsson, Gunnar K., Mecklenburg, Matthew, Orvis, Thomas, Das, Sujit, Tang, Yun-Long, Suresha, Jaganatha S., Yi, Di, Dasgupta, Abhigyan, Doenning, David, Ruiz, Victor G., Yadav, Ajay K., Trassin, Morgan, Heron, John T., Fadley, Charles S., Pentcheva, Rossitza, Ravichandran, Jayakanth, and Ramesh, Ramamoorthy

Subjects
Physik (inkl. Astronomie)
Published
2018

57. Unexpected termination switching and polarity compensation in LaAlO3/SrTiO3 heterostructures

Author

Singh-Bhalla, Guneeta, primary, Rossen, Pim B., additional, Pálsson, Gunnar K., additional, Mecklenburg, Matthew, additional, Orvis, Thomas, additional, Das, Sujit, additional, Tang, Yun-Long, additional, Suresha, Jaganatha S., additional, Yi, Di, additional, Dasgupta, Abhigyan, additional, Doenning, David, additional, Ruiz, Victor G., additional, Yadav, Ajay K., additional, Trassin, Morgan, additional, Heron, John T., additional, Fadley, Charles S., additional, Pentcheva, Rossitza, additional, Ravichandran, Jayakanth, additional, and Ramesh, Ramamoorthy, additional

Published
2018
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64. Spin Hall torques generated by rare-earth thin films

Author

Reynolds, Neal, primary, Jadaun, Priyamvada, additional, Heron, John T., additional, Jermain, Colin L., additional, Gibbons, Jonathan, additional, Collette, Robyn, additional, Buhrman, R. A., additional, Schlom, D. G., additional, and Ralph, D. C., additional

Published
2017
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66. High Dynamic Range Pixel Array Detector for Scanning Transmission Electron Microscopy

Author

Tate, Mark W., primary, Purohit, Prafull, additional, Chamberlain, Darol, additional, Nguyen, Kayla X., additional, Hovden, Robert, additional, Chang, Celesta S., additional, Deb, Pratiti, additional, Turgut, Emrah, additional, Heron, John T., additional, Schlom, Darrell G., additional, Ralph, Daniel C., additional, Fuchs, Gregory D., additional, Shanks, Katherine S., additional, Philipp, Hugh T., additional, Muller, David A., additional, and Gruner, Sol M., additional

Published
2016
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69. Engineering Carrier Effective Masses in Ultrathin Quantum Wells of IrO2.

Author

Kawasaki, Jason K., Kim, Choong H., Nelson, Jocienne N., Crisp, Sophie, Zollner, Christian J., Biegenwald, Eric, Heron, John T., Fennie, Craig J., Schlom, Darrell G., and Shen, Kyle M.

Subjects
*IRIDIUM oxide, *QUANTUM wells, *THIN films
Abstract

The carrier effective mass plays a crucial role in modern electronic, optical, and catalytic devices and is fundamentally related to key properties of solids such as the mobility and density of states. Here we demonstrate a method to deterministically engineer the effective mass using spatial confinement in metallic quantum wells of the transition metal oxide IrO2. Using a combination of in situ angle-resolved photoemission spectroscopy measurements in conjunction with precise synthesis by oxide molecular-beam epitaxy, we show that the low-energy electronic subbands in ultrathin films of rutile IrO2 have their effective masses enhanced by up to a factor of 6 with respect to the bulk. The origin of this strikingly large mass enhancement is the confinement-induced quantization of the highly nonparabolic, three-dimensional electronic structure of IrO2 in the ultrathin limit. This mechanism lies in contrast to that observed in other transition metal oxides, in which mass enhancement tends to result from complex electron-electron interactions and is difficult to control. Our results demonstrate a general route towards the deterministic enhancement and engineering of carrier effective masses in spatially confined systems, based on an understanding of the three-dimensional bulk electronic structure. [ABSTRACT FROM AUTHOR]

Published
2018
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70. Interface Transparency and Rashba Spin Torque Enhancement in WSe 2 Heterostructures.

Author

Novakov S, Jariwala B, Vu NM, Kozhakhmetov A, Robinson JA, and Heron JT

Abstract

Rashba spin current generation emerges in heterostructures of ferromagnets and transition metal dichalcogenides (TMDs) due to an interface polarization and associated inversion symmetry breaking. Recent work exploring the synthesis and transfer of epitaxial films on the top of low layer count 2D materials reveals that atomic potentials from the underlying substrate interface are not completely screened. The extension of this transparency effect to other interfacial phenomena, such as the Rashba effect and associated spin torques, has not yet been demonstrated. Here, we report enhanced spin transfer torques from the Rashba spin current in heterostructures of permalloy (Py) and WSe 2 . We show that insertion of up to two monolayers of WSe 2 enhances the spin transfer torques in a Rashba system by up to 3×, without changing the fieldlike Rashba spin-orbit torque (SOT), a measure of interface polarization. Our results indicate that low layer count TMD films can be used as an interfacial "scattering promoter" in heterostructure interfaces without quenching the original polarization.

Published
2021
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