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However, the conventional heterostructure strategy to engineer a vdW device through complicated and cumbersome stacking strategies is facing a high fabrication cost. Tailoring broken time\u2010reversal symmetries to integrate a distinct magnetic order into a vdW system, by only employing a simplified geometry and the advantage of unique components, currently remains highly challenging. In this work we propose the use of a gradient doping of magnetic atoms in bicollinear antiferromagnetic (AFM) parent vdW magnet to fabricate an AFM\/ferromagnetic (FM) heterojunction in a single Fe\n                    <jats:sub>1+<\/jats:sub>\n                    <jats:italic>\n                      <jats:sub>y<\/jats:sub>\n                    <\/jats:italic>\n                    Te film, which enables an exchange bias (EB) effect. We demonstrate the emergence of robust FM order and an EB effect in a vdW Fe\n                    <jats:sub>1+y<\/jats:sub>\n                    Te film. This originates from heavy Fe doping in the interfacial layers and the breaking of symmetry in the bicollinear AFM order within the lightly doped layers away from the interface. This work not only opens a new avenue for manipulating AFM\/FM heterojunction in a single parent vdW system but also provides new insights into understanding the production of the EB effect on the bicollinear AFM vdW device platform.\n                  <\/jats:p>","DOI":"10.1002\/adma.202517358","type":"journal-article","created":{"date-parts":[[2026,2,9]],"date-time":"2026-02-09T07:01:33Z","timestamp":1770620493000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Integrating Antiferromagnetic\/Ferromagnetic Heterojunction in Van Der Waals Fe\n                    <sub>1+<\/sub>\n                    <i>\n                      <sub>y<\/sub>\n                    <\/i>\n                    Te Film With Gradient Fe Doping"],"prefix":"10.1002","volume":"38","author":[{"given":"Daheng","family":"Liu","sequence":"first","affiliation":[{"name":"Shenyang National Laboratory for Materials Science Institute of Metal Research 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