Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 46: Spin Transport and Orbitronics, Spin-Hall Effects I (joint session MA/TT)
TT 46.11: Talk
Wednesday, March 11, 2026, 12:30–12:45, POT/0112
Spin-Current Sensitivity in CuSeO3 Across the Antiferromagnetic Transition — •Ankita Nayak1, Mathew James1, Maxim Mostovoy2, and Aisha Aqeel1 — 1University of Augsburg, 86135Augsburg, Germany — 2Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
Antiferromagnets are promising materials for next-generation spintronics due to their robustness against magnetic fields and ultrafast dynamics. Spin Hall magnetoresistance (SMR) provides a sensitive method to probe spin transport at normal-metal–antiferromagnetic-insulator interfaces. In antiferromagnets, SMR can detect Néel-vector reorientation, spin-flop behaviour, and short-range correlations above the ordering temperature, as shown in systems such as NiO and α-Fe2O3.
Here, we use SMR in a Pt/CuSeO3 bilayer to investigate spin transport in the unconventional antiferromagnet CuSeO3. An AC current in the Pt Hall bar generates a transverse spin accumulation, whose interface reflection modulates the Pt resistance and enables electrical detection of the magnetic state.
CuSeO3 consists of Cu(1) spin dimers and Cu(2) spins that order antiferromagnetically below 8 K. SMR measurements between 5 and 100 K with magnetic-field rotation in three planes reveal clear SMR signals, including a finite response above the Néel temperature, indicating persistent spin correlations. The plane-dependent SMR amplitude also reflects the intrinsic magnetic anisotropy of CuSeO3.
Keywords: Unconvenstional antiferromagnet; Spin-Hall magnetoristance