Papers by Jostein Grepstad
Physical Review B, 2020
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APL Materials, 2015
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The development of spintronic devices based on ferromagnetic (FM) and antiferromagnetic (AF) mate... more The development of spintronic devices based on ferromagnetic (FM) and antiferromagnetic (AF) materials requires the ability to design spin textures such as artificial magnetic skyrmions, which are characterized by adjacent FM regions of a thin film with both in-plane and out-of-plane moments. In particular, AF spin textures have received significant interest in recent years due to their promising characteristics including fast operating speeds, nanoscalability, and stability against magnetic stray fields. Due to their strong interactions between charge, spin, lattice, and orbital degrees of freedom, strongly correlated electron systems such as FM La<sub>0.7</sub>Sr<sub>0.3</sub>MnO<sub>3</sub> (LSMO) and AF La<sub>1-x</sub>Sr<sub>x</sub>FeO<sub>3</sub> (LSFO) provide an ideal platform for the design of magnetic spin textures. In this work, an ion implantation-based patterning process was used to define magnetic ...
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Applied Physics Letters, 2019
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Effects of substrate annealing on the goldcatalyzed
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Physical Review Research, 2020
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Applied Physics Letters, 2018
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APL Materials, 2017
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Journal of Crystal Growth, 2012
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Applied Physics Letters, 2018
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Thin Solid Films, 2013
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AIP Advances
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ACS nano, Sep 27, 2016
Engineered topological spin textures with submicron dimensions in magnetic materials have emerged... more Engineered topological spin textures with submicron dimensions in magnetic materials have emerged in recent years as the building blocks for various spin-based memory devices. Examples of these magnetic configurations include magnetic skyrmions, vortices, and domain walls. Here, we show the ability to control and characterize the evolution of spin textures in complex oxide micromagnets as a function of temperature through the delicate balance of fundamental materials parameters, micromagnet geometries, and epitaxial strain. These results demonstrate that in order to fully describe the observed spin textures, it is necessary to account for the spatial variation of the magnetic parameters within the micromagnet. This study provides the framework to accurately characterize such structures, leading to efficient design of spin-based memory devices based on complex oxide thin films.
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Physica C, 1997
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Acta Chemica Scandinavica Series a Physical and Inorganic Chemistry, 1988
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Applied Physics Letters, Jun 7, 2009
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Journal of Electron Spectroscopy and Related Phenomena, Mar 1, 1997
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Using photoemission electron microscopy in combination with X-ray magnetic linear dichroism, we r... more Using photoemission electron microscopy in combination with X-ray magnetic linear dichroism, we report reconfiguration upon nanostructuring of the antiferromagnetic domain structure in epitaxial LaFeO3 thin films. Antiferromagnetic (AFM) nanoislands were synthesized using a dedicated process, devised to define nanostructures with magnetic order embedded in a paramagnetic matrix. Significant impact on the AFM domain configuration was observed. Extended domains were found to form along edges parallel to the in-plane &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;100&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt; crystalline axes of the cubic substrate, with their AFM spin axis parallel to the edge. No such edge-imposed domain configuration was found for nanoislands defined with the edges at 45° with the in-plane crystalline axes. Epitaxial constraints on the film crystalline structure appear to play an important role in the formation of the edge-bound extended AFM domains. The data indicate a magnetostatic origin of this domain reconfiguration.
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J Vac Sci Technol a, 2009
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Nanotechnology, 2009
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Papers by Jostein Grepstad