[23a-E205-1~10] 10.1 Emerging materials in spintronics and magnetics (including fabrication and characterization methodologies)

▼ [23a-E205-3] Sm-Co-based amorphous alloy films for zero-field transverse thermoelectric generation

〇(P)Rajkumar Modak¹, Yuya Sakuraba¹, Takamasa Hirai¹, Takashi Yagi², Hossen Sepehri Amin¹, Hiroto Masuda³, Takeshi Seki^1,3,4, Koki Takanashi^3,4,5, Weinan Zhou¹, Tadakatsu Ohkubo¹, Ken-ichi Uchida^1,3,4 (1.NIMS, 2.AIST, 3.IMR, Tohoku Univ., 4.CSRN, Tohuku Univ., 5.CSIS, Tohuku Univ.)

Keywords:Thermoelectric permanent magnets, anomalous Nernst effect, Lock-in thermography

Using combinatorial material science and lock-in thermography we have systematically investigated the composition dependence anomalous Ettingshausen effect (AEE) for Sm_xCo_1-x (0 ≤ x ≤ 100) composition-spread amorphous films and confirmed Sm₂₀Co₈₀ show largest AEE induced temperature modulation. We further demonstrated that the AEE in Sm₂₀Co₈₀ can be improved by systematically replacing Co with Fe by preparing Sm₂₀(Co_1-yFe_y)₈₀ (0 ≤ y ≤ 100) composition spread films and determined Sm₂₀(Co₇₇Fe₂₃₎₈₀ composition exhibits largest AEE in these alloys. The presence of high in-plane remanent magnetization and coercive force in our films makes it advantageous over conventional materials for applications including heat flux sensors, as these materials can generate thermoelectric output without an external magnetic field. Importantly, these amorphous films can be fabricated on any surfaces including flexible substrate which makes it suitable candidate for wearable flexible thermoelastic devices.