{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"2acd1b86245c6cded581a406b7ec060b1c3989f7e5f108e1c077fee3ac29703f","created":"2026-10-03T07:17:58Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"1edbd8e2c4ab0d34755723c8999fc7dc9f271b3c9b2a1b83a4c13fe8cb791e42","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"cm.altermagnets.all-altermagnet-tmr","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"Theory predicts that a tunnel junction made only of altermagnets should change its resistance strongly when one electrode's spin pattern is reversed, giving a memory bit without ferromagnets. No experiment has yet shown this in a junction built only from altermagnets.","posed_since":"2022","precise":"In an altermagnet/insulator/altermagnet junction (candidates CrSb, Cr-doped RuO2, KV2Se2O, MnTe) with no ferromagnetic layer, measure $\\mathrm{TMR}=(R_{\\mathrm{AP}}-R_{\\mathrm{P}})/R_{\\mathrm{P}}$ at $T=300\\,\\mathrm{K}$, where P and AP denote parallel and antiparallel Neel vectors, and determine whether it exceeds 100 percent as nonrelativistic spin-splitting theory predicts. An answer is the measured TMR with device structure and evidence that it arises from the altermagnetic band splitting.","problem_ref":null,"references":"","settled_by":"Epitaxial all-altermagnet junctions with controlled Neel-vector switching and room-temperature TMR measurements.","status_note":"Work found for 2025-2026 is theoretical: a CrSb-based junction proposal (arXiv:2503.13850) and a first-principles all-altermagnet Cr-doped RuO2/TiO2/Cr-doped RuO2 junction (arXiv:2607.21092); no experimental all-altermagnet junction with TMR above 100 percent at 300 K was found.","title":"Large tunneling magnetoresistance in all-altermagnetic tunnel 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