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arXiv · 2605.00491

Electrical detection of spin-flip transition in metal/\ce{Na_5Co_{15.5}Te_6O_{36}} heterostructure

Hirotsugu Tagami·Takuya Kawada·Yuki Shiomi
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Abstract

We report on the longitudinal magnetoresistance (MR) in thin metal films on an Ising-type antiferromagnetic insulator, \ce{Na_5Co_{15.5}Te_6O_{36}} (\ce{NCTO}). Steep changes in the MR spectra with hysteresis were observed at spin-flip transitions driven by magnetic fields applied along the easy axis of the \ce{NCTO} crystal. The MR jumps almost follow step-like changes in magnetization at the spin-flip transition. At very low temperatures where \ce{Co} moments are partially frozen, the MR anomalies exhibit a tunnel-magnetoresistance-like shape. The observed MR anomalies at the spin-flip transition are attributed to strain effects via magnetostriction upon the magnetic-structure change of the \ce{Co} nets in \ce{NCTO}, because similar MR jumps are observed in \ce{Pt/NCTO}, \ce{Pt/SiO_x/NCTO}, and \ce{Cu/NCTO} heterostructures. Interestingly, we found that the high-field slopes of the MR spectra show opposite signs between \ce{Pt/NCTO} and \ce{Cu/NCTO} at low temperatures. Because similar MR spectra are observed for \ce{Pt/SiO_x/NCTO} in which the interface magnetic interaction is negligible, the weak antilocalization due to the strong spin-orbit interaction of the Pt films is likely to contribute to the low-temperature MR.

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Hirotsugu Tagami, Takuya Kawada, Yuki Shiomi. 2026-05-01. Electrical detection of spin-flip transition in metal/\ce{Na_5Co_{15.5}Te_6O_{36}} heterostructure. https://arxiv.org/abs/2605.00491

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