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Author: search.filters.author.Horprathum, MatiSubject: search.filters.subject.spin caloritronics

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    Design and Implementation of a High-Field NdFeB Magnet System for Investigating the Spin Seebeck Effect
    (2025-01-01)
    Nachaithong, Theeranuch
    ;
    Wongjom, Chalothon
    ;
    Samransuksamer, Benjarong
    ;
    Phumying, Santi
    ;
    Pongophas, Ekkarat
    The generation of pure spin current through thermal gradients, known as the spin Seebeck effect (SSE), has garnered significant interest in spintronics. In this study, we design and construct a permanent magnetic instrument setup to generate a variable external magnetic field using NdFeB permanent magnets to observe the SSE. The experimental setup is composed of three crucial components: the magnetic field, the temperature gradient, and electronic control systems. Si/yttrium iron garnet (YIG)/platinum (Pt) and Si/nickel (Ni) samples, prepared via sputtering techniques, were utilized for standard calibration purposes. The results show that the external magnetic field produced by NdFeB varies with the gap distance between the two magnetic poles, following an exponential decrease in field strength with increasing gap distance. The magnetic field at the center can be adjusted from ±20 to ±5000 Oe. The temperature gradient stabilizes after approximately 10 min, with a temperature difference ( ΔT ) between the heated and cooled sides ranging from 0 to 30 K. For instrument testing, we performed magnetic field and angle-dependent measurements on Si/YIG/Pt and Si/Ni samples. The results indicate that the magnetic field dependence of the permanent magnet instrument (PMI) does not exhibit the voltage loop switching seen with an alternative magnetic coil (AMC) but shows analogous behavior at high magnetic fields. Moreover, the angle dependence of both PMI and AMC yielded comparable results. In conclusion, our PMI setup procedures effectively facilitate the observation of the SSE.
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    Low-Cost Instrument for the Versatile Measurement of Spin Caloritronic Phenomena: Spin Seebeck Effect, Anisotropic Magnetoresistance, Anomalous Hall Effect, and Anomalous Nernst Effect
    (2023-01-01)
    Pongophas, Ekkarat
    ;
    Infahsaeng, Yingyot
    ;
    Maiaugree, Wasan
    ;
    Phumying, Santi
    ;
    Pattanakul, Rungrueang
    In this article, we report on a low-cost instrument for the versatile measurement of spin caloritronics phenomena such as the spin Seebeck effect (SSE), anomalous Nernst effect (ANE) anisotropic magnetoresistance (AMR), and anomalous Hall effect (AHE). Solenoid coils provide a uniform variable magnetic field while the sample was sandwiched between thermal baths and measured in a vacuum chamber. Our results show excellent magnetic field uniformity (±0.37 mT) within the magnet gap and high stability of the generated temperature difference (±0.07 K). For verifying the effectiveness of our instrument, Yttrium Iron garnet (YIG)/Co structure was used to measure the SSE, AMR, and AHE, while a SiO2/Co structure was used for measuring the ANE. Our SSE measurements of the YIG/Co structure were found to be comparable with that of a commercially available instrument. We can therefore conclude that our low-cost and versatile instrument can be used to effectively observe spin Caloritronics phenomena.