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Compared with halides and chalcogenides, transition-metal nitrides (TMN2) feature short metal\u2013nitrogen bonds and strong p-d hybridization, which can substantially reshape crystal-field splitting and magnetic exchange pathways. Through systematic first-principles screening of hexagonal h-TMN2 (TM = 3,4,5d) monolayers, we identify h-VN2 and h-CrN2 as the only stable candidates exhibiting intrinsic PMA and half-metallicity with sizable spin-flip gaps (\u0394sf = 0.27\u00a0eV for h-VN2 and 0.25\u00a0eV for h-CrN2). Phonon spectra and ab\u00a0initio molecular dynamics simulations confirm their dynamical and thermal stability, with h-VN2 preserving crystalline integrity up to 800\u00a0K. Monte Carlo simulations confirm out-of-plane easy axes with TC values of \u2248305\u00a0K for h-VN2 and \u2248134\u00a0K for h-CrN2. Notably, h-VN2 exhibits pronounced magnetoelectric tunability: its half-metallicity and PMA are robustly preserved within a broad biaxial strain window (\u22122%\u2013+3%), maintaining near-room-temperature TC. In bilayer configurations, vertical stacking further strengthens exchange interactions, enhancing TC to \u223c477\u00a0K. Furthermore, h-VN2 sustains its ferromagnetism and PMA at both graphene and MoS2 interfaces, underscoring its compatibility with existing 2D platforms. These results highlight h-VN2 as a versatile platform where nitrogen-mediated exchange facilitates robust, high-temperature ferromagnetism for next-generation van der Waals spintronics.<\/jats:p>","DOI":"10.1063\/5.0331410","type":"journal-article","created":{"date-parts":[[2026,6,8]],"date-time":"2026-06-08T10:57:16Z","timestamp":1780916236000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":1,"title":["Nitrogen-driven ferromagnetism and perpendicular magnetic anisotropy in two-dimensional transition-metal nitrides"],"prefix":"10.1063","volume":"164","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-7678-7596","authenticated-orcid":false,"given":"Xianxing","family":"Li","sequence":"first","affiliation":[{"name":"College of Physics, Guizhou Province Key Laboratory for Photoelectrics Technology and Application, Guizhou University 1 , Guiyang City 550025,","place":["People\u2019s Republic of 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210093,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8515-1136","authenticated-orcid":false,"given":"Qiong","family":"Peng","sequence":"additional","affiliation":[{"name":"College of Physics, Guizhou Province Key Laboratory for Photoelectrics Technology and Application, Guizhou University 1 , Guiyang City 550025,","place":["People\u2019s Republic of China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-7737-7234","authenticated-orcid":false,"given":"Junfei","family":"Ding","sequence":"additional","affiliation":[{"name":"College of Physics, Guizhou Province Key Laboratory for Photoelectrics Technology and Application, Guizhou University 1 , Guiyang City 550025,","place":["People\u2019s Republic of China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nanjing","family":"Zheng","sequence":"additional","affiliation":[{"name":"College of Physics, Guizhou 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