Ion-Irradiation-Induced Cobalt/Cobalt Oxide Heterostructures: Printing 3D Interfaces
| Autor: | Oguz Yildirim, Donovan Hilliard, Lakshmi Ramasubramanian, Roman Böttger, Shengqiang Zhou, Jürgen Faßbender, Olav Hellwig, Hamza Cansever, Sri Sai Phani Kanth Arekapudi, Alina M. Deac, Jürgen Lindner, C. Fowley, Leopold Koch |
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| Rok vydání: | 2020 |
| Předmět: |
displacement
Materials science bias magnetic cobalt oxide chemistry.chemical_element FOS: Physical sciences reduction perpencular 02 engineering and technology anisotropy magnetization 01 natural sciences Ion Condensed Matter::Materials Science Co3O4 0103 physical sciences General Materials Science Irradiation Symmetry breaking Cobalt oxide paramagnetic 010302 applied physics Condensed Matter - Materials Science Condensed matter physics irradiation removal exchange Materials Science (cond-mat.mtrl-sci) Heterojunction 021001 nanoscience & nanotechnology Exchange bias Ferromagnetism chemistry ferromagnetic antiferromagnetic Condensed Matter::Strongly Correlated Electrons ion 0210 nano-technology Cobalt oxygen CoO proton |
| Zdroj: | ACS Applied Materials and Interfaces 12(2020)8, 9858-9864 |
| ISSN: | 1944-8252 |
| Popis: | Interfaces separating ferromagnetic (FM) layers from non-ferromagnetic layers offer unique properties due to spin-orbit coupling and symmetry breaking, yielding effects such as exchange bias, perpendicular magnetic anisotropy, spin-pumping, spin-transfer torques, conversion between charge and spin currents and vice-versa. These interfacial phenomena play crucial roles for magnetic data storage and transfer applications, which require forming FM nano-structures embedded in non-ferromagnetic matrices. Here, we investigate the possiblity of creating such nano-structures by ion-irradiation. We study the effect of lateral confinement on the ion-irradiation-induced reduction of non-magnetic metal oxides (e.g., antiferro- or paramagnetic) to form ferromagnetic metals. Our findings are later exploited to form 3-dimensional magnetic interfaces between Co, CoO and Pt by spatially-selective irradiation of CoO/Pt multilayers. We demonstrate that the mechanical displacement of the O atoms plays a crucial role during the reduction from insulating, non-ferromagnetic cobalt oxides to metallic cobalt. Metallic cobalt yields both perpendicular magnetic anisotropy in the generated Co/Pt nano-structures, and, at low temperatures, exchange bias at vertical interfaces between Co and CoO. If pushed to the limit of ion-irradiation technology, this approach could, in principle, enable the creation of densely-packed, atomic scale ferromagnetic point-contact spin-torque oscillator (STO) networks, or conductive channels for current-confined-path based current perpendicular-to-plane giant magnetoresistance read-heads. Comment: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials and Interfaces copyright \c{opyright} American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https:// pubs.acs.org/articlesonrequest/AOR-rPGr2e7nZ7tzzwK3tnBZ |
| Databáze: | OpenAIRE |
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