講演情報
[11a-E214-6]Modulation of Thermal Conductivity in Pseudo Spin-Valve FePt/NiO/CoFeB Induced by Changes in Magnetization Alignment
〇Kento Sugawara1,2, Takumi Yamazaki2, Takeshi Seki2,3,4 (1.Grad. Sch. of Eng., Tohoku Univ., 2.IMR, Tohoku Univ., 3.CSIS, Tohoku Univ., 4.SRIS, Tohoku Univ.)
キーワード：
giant magneto-thermal resistance effect、thermal conductivity、pseudo spin-valve
The giant magneto-thermal resistance (GMTR), the thermal counterpart of giant magneto resistance, refers to a change in thermal conductivity between parallel (P) and antiparallel (AP) magnetization configurations in a ferromagnetic metal (FM)/nonmagnetic metal/FM structure. Although previous studies suggested that magnons contribute to GMTR, direct experimental evidence remains lacking. In this study, we investigate the effective thermal conductivity of an FM/NiO/FM structure. Here, NiO serves as an antiferromagnetic insulating spacer that suppresses charge transport while allowing magnon-mediated heat transport. To switch between the P and AP configurations, a pseudo spin-valve structure consisting of FePt/NiO/CoFeB was fabricated. Magnetization measurements revealed a characteristic two-step hysteresis loop, confirming pseudo spin-valve behavior. Thermal conductivity measurements using the 2ω method revealed a difference in effective thermal conductivity between the P and AP configurations, indicating a modulation of thermal transport associated with magnetization alignment.