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Electric field control of magnetic properties offers a broad and promising toolbox for enabling ultra-low power electronics. A key challenge with high technological relevance is to master the interplay between the magnetic anisotropy of a ferromagnet and the exchange coupling to an adjacent antiferromagnet. Here, we demonstrate that magneto-ionic gating can be used to achieve a very stable out-of-plane (OOP) oriented magnetization with strong exchange bias in samples with as-deposited preferred in-plane (IP) magnetization. We show that the perpendicular interfacial anisotropy can be increased by more than a factor 2 in the stack Ta/Pt/PtMn/Co/HfO2 by applying −2.5 V gate voltage over 3 nm HfO2, causing a reorientation of the magnetization from IP to OOP with a strong OOP exchange bias of more than 50 mT. Comparing two thicknesses of PtMn, we identify a notable trade-off: while thicker PtMn yields a significantly larger exchange bias, it also results in a slower response to ionic liquid gating within the accessible gate voltage window. These results pave the way for post-deposition electrical tailoring of magnetic anisotropy and exchange bias in samples requiring significant exchange bias.

", "funding": [ { "award": { "number": "860060", "title": { "en": "MagnEFi" } }, "funder": { "id": "00k4n6c32", "name": "European Commission" } } ], "languages": [ { "id": "eng", "title": { "en": "English" } } ], "publication_date": "2024-06-05", "publisher": "AIP", "resource_type": { "id": "publication-article", "title": { "de": "Zeitschriftenartikel", "en": "Journal article" } }, "rights": [ { "description": { "en": "The Creative Commons Attribution license allows re-distribution and re-use of a licensed work on the condition that the creator is appropriately credited." }, "icon": "cc-by-icon", "id": "cc-by-4.0", "props": { "scheme": "spdx", "url": "https://creativecommons.org/licenses/by/4.0/legalcode" }, "title": { "en": "Creative Commons Attribution 4.0 International" } } ], "subjects": [ { "subject": "Exchange interactions, Superconducting quantum interference device, Ferromagnetic materials, Magnetic anisotropy, Magnetic materials, Hall effect sensor, Data storage and retrieval, Power electronics, X-ray photoelectron spectroscopy, Ionic liquids" } ], "title": "Stabilizing perpendicular magnetic anisotropy with strong exchange bias in PtMn/Co by magneto-ionics" }, "parent": { "access": { "owned_by": { "user": "143471" }, "settings": { "accept_conditions_text": null, "allow_guest_requests": false, "allow_user_requests": false, "secret_link_expiration": 0 } }, "communities": {}, "id": "11549216", "pids": {} }, "pids": { "doi": { "identifier": "10.1063/5.0213731", "provider": "external" }, "oai": { "identifier": "oai:zenodo.org:11549217", "provider": "oai" } }, "revision_id": 4, "stats": { "all_versions": { "data_volume": 196574400.0, "downloads": 73, "unique_downloads": 69, "unique_views": 87, "views": 88 }, "this_version": { "data_volume": 196574400.0, "downloads": 73, "unique_downloads": 69, "unique_views": 87, "views": 88 } }, "status": "published", "swh": {}, "updated": "2024-06-10T13:46:46.062232+00:00", "versions": { "index": 1, "is_latest": true } }