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Insulator\u2010based spintronic devices, which leverage quantized spin waves (magnons), offer a promising solution. Among insulating materials, yttrium iron garnet (YIG; Y\n                    <jats:sub>3<\/jats:sub>\n                    Fe\n                    <jats:sub>5<\/jats:sub>\n                    O\n                    <jats:sub>12<\/jats:sub>\n                    ) is notable for its ultra\u2010low magnetic damping; however, its exchange bias (EB) effect at room temperature remains inadequate for robust device operation. In this study, a new materials platform is developed by pairing YIG with cobalt ferrite (CFO; CoFe\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>4<\/jats:sub>\n                    ), achieving a record\u2010high exchange bias field (\n                    <jats:italic>H<\/jats:italic>\n                    <jats:sub>EB<\/jats:sub>\n                    ) of 59 \u00b1 4\u00a0Oe at room temperature, as determined by angular\u2010dependent ferromagnetic resonance measurements of YIG\u2013CFO bulk composites. This large\n                    <jats:italic>H<\/jats:italic>\n                    <jats:sub>EB<\/jats:sub>\n                    can be attributed to a strong antiparallel exchange interaction at the YIG\u2013CFO interface. These findings indicate a promising route toward achieving strong EB effects in thin\u2010film YIG\u2013CFO systems and provide a straightforward materials strategy for engineering enhanced magnetic coupling in insulating systems.\n                  <\/jats:p>","DOI":"10.1002\/smll.202507992","type":"journal-article","created":{"date-parts":[[2025,11,20]],"date-time":"2025-11-20T13:42:07Z","timestamp":1763646127000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Large Room\u2010Temperature Exchange Bias in Y\n                    <sub>3<\/sub>\n                    Fe\n                    <sub>5<\/sub>\n                    O\n                    <sub>12<\/sub>\n                    via Antiparallel Exchange Interaction with Magnetically Pinned CoFe\n                    <sub>2<\/sub>\n                    O\n                    <sub>4<\/sub>\n                    Nanoparticles"],"prefix":"10.1002","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-6286-2835","authenticated-orcid":false,"given":"Junseok","family":"Kim","sequence":"first","affiliation":[{"name":"Department of Mechanical Engineering Pohang University of Science and Technology (POSTECH)  Pohang 37673 South Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1684-4876","authenticated-orcid":false,"given":"Sang J.","family":"Park","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering Pohang University of Science and Technology (POSTECH)  Pohang 37673 South Korea"},{"name":"Present address: National Institute for Materials Science Tsukuba 305\u20100047 Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2662-7077","authenticated-orcid":false,"given":"Phuoc Cao","family":"Van","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering Chungnam National University  Daejeon 34134 South Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hyeongyu","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Physics Korea Advanced Institute of Science and Technology (KAIST)  Daejeon 34141 South Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0295-4030","authenticated-orcid":false,"given":"Jong\u2010Ryul","family":"Jeong","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering Chungnam National University  Daejeon 34134 South Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8378-3746","authenticated-orcid":false,"given":"Kab\u2010Jin","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Physics Korea Advanced Institute of Science and Technology (KAIST)  Daejeon 34141 South 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