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Here, electrical transport measurements are performed on 1 SL MnBi\n                    <jats:sub>2<\/jats:sub>\n                    Te\n                    <jats:sub>4<\/jats:sub>\n                    \/\n                    <jats:italic>n<\/jats:italic>\n                    QL Bi\n                    <jats:sub>2<\/jats:sub>\n                    Te\n                    <jats:sub>3<\/jats:sub>\n                    \/1 SL MnBi\n                    <jats:sub>2<\/jats:sub>\n                    Te\n                    <jats:sub>4<\/jats:sub>\n                    sandwich heterostructures (\n                    <jats:italic>n<\/jats:italic>\n                    = 0\u20134) to investigate the role of Bi\n                    <jats:sub>2<\/jats:sub>\n                    Te\n                    <jats:sub>3<\/jats:sub>\n                    spacer thickness in tuning interlayer magnetic interactions. Magnetotransport reveals that even 1 QL Bi\n                    <jats:sub>2<\/jats:sub>\n                    Te\n                    <jats:sub>3<\/jats:sub>\n                    is sufficient to switch the intrinsic antiferromagnetic coupling in 2 SL MnBi\n                    <jats:sub>2<\/jats:sub>\n                    Te\n                    <jats:sub>4<\/jats:sub>\n                    to ferromagnetic, evidenced by Hall hysteresis and the absence of spin\u2010flop transitions. Increasing\n                    <jats:italic>n<\/jats:italic>\n                    leads to a monotonic decrease in coercivity and Curie temperature, reflecting progressively weaker interlayer coupling, with a simultaneous enhancement in anomalous Hall response at\n                    <jats:italic>n<\/jats:italic>\n                    = 4. These results demonstrate reversible control of spin configuration by magnetic field and confirm the role of magnetic proximity\u2010induced exchange coupling in determining the interlayer magnetic ground state, highlighting this atomic\u2010scale spacer\u2010engineered heterostructure as a compelling platform for spintronic applications and tunable symmetry\u2010broken topological quantum phases.\n                  <\/jats:p>","DOI":"10.1002\/advs.202514562","type":"journal-article","created":{"date-parts":[[2026,1,27]],"date-time":"2026-01-27T12:05:14Z","timestamp":1769515514000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Ferromagnetic Interlayer Exchange Coupling in Magnetic Topological Insulator Sandwich Heterostructures"],"prefix":"10.1002","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-7895-4595","authenticated-orcid":false,"given":"Enayet","family":"Hossain","sequence":"first","affiliation":[{"name":"School of Physics and Astronomy Monash University  Clayton Victoria Australia"},{"name":"ARC Centre of Excellence for Future Low\u2010Energy Electronics Technologies (FLEET) Monash University  Clayton Victoria Australia"},{"name":"Department of Physics University of Dhaka  Dhaka Bangladesh"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Grace L.","family":"Causer","sequence":"additional","affiliation":[{"name":"School of Physics and Astronomy Monash University  Clayton Victoria Australia"},{"name":"ARC Centre of Excellence for Future Low\u2010Energy Electronics Technologies (FLEET) Monash University  Clayton Victoria Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qile","family":"Li","sequence":"additional","affiliation":[{"name":"School of Physics and Astronomy Monash University  Clayton Victoria Australia"},{"name":"ARC Centre of Excellence for Future Low\u2010Energy Electronics Technologies (FLEET) Monash University  Clayton Victoria Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sergey","family":"Rubanov","sequence":"additional","affiliation":[{"name":"Ian Holmes Imaging Centre (IHIC), Bio21 Institute University of Melbourne  Melbourne Victoria Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kaijian","family":"Xing","sequence":"additional","affiliation":[{"name":"School of Physics and Astronomy Monash University  Clayton Victoria Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"James","family":"Blyth","sequence":"additional","affiliation":[{"name":"School of Physics and Astronomy Monash University  Clayton Victoria Australia"},{"name":"ARC Centre of Excellence for Future Low\u2010Energy Electronics Technologies (FLEET) Monash University  Clayton Victoria Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mohammad T. H.","family":"Bhuiyan","sequence":"additional","affiliation":[{"name":"School of Physics and Astronomy Monash University  Clayton Victoria Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mengting","family":"Zhao","sequence":"additional","affiliation":[{"name":"School of Physics and Astronomy Monash University  Clayton Victoria Australia"},{"name":"ARC Centre of Excellence for Future Low\u2010Energy Electronics Technologies (FLEET) Monash University  Clayton Victoria Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matthew","family":"Gebert","sequence":"additional","affiliation":[{"name":"School of Physics and Astronomy Monash University  Clayton Victoria Australia"},{"name":"ARC Centre of Excellence for Future Low\u2010Energy Electronics Technologies (FLEET) Monash University  Clayton Victoria Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael 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