Design and Implementation of a High-Field NdFeB Magnet System for Investigating the Spin Seebeck Effect

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dc.contributor.authorNachaithong, Theeranuch
dc.contributor.authorWongjom, Chalothon
dc.contributor.authorSamransuksamer, Benjarong
dc.contributor.authorPhumying, Santi
dc.contributor.authorPongophas, Ekkarat
dc.contributor.authorMaiaugree, Wasan
dc.contributor.authorPijitrojana, Wanchai
dc.contributor.authorHorprathum, Mati
dc.contributor.authorChananonnawathorn, Chanunthorn
dc.contributor.authorPinitsoontorn, Supree
dc.contributor.authorMoontragoon, Pairot
dc.contributor.authorRamamoorthy, Harihara
dc.contributor.authorSomphonsane, Ratchanok
dc.contributor.authorKalasuwan, Pruet
dc.contributor.authorWongjom, Poramed
dc.date.accessioned2026-08-06T10:50:14Z
dc.date.available2026-08-06T10:50:14Z
dc.date.issued2025-01-01
dc.description.abstractThe 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.
dc.identifier.citationIEEE Transactions on Instrumentation and Measurement, 74, 2025
dc.identifier.doi10.1109/TIM.2025.3545533
dc.identifier.issn00189456
dc.identifier.other2-s2.0-105001089141
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/16735
dc.sourceIEEE Transactions on Instrumentation and Measurement
dc.subjectAnomalous Nernst effect (ANE)
dc.subjectinverse spin Hall effect (ISHE)
dc.subjectNdFeB
dc.subjectpermanent magnet
dc.subjectspin caloritronics
dc.subjectspin Seebeck effect (SSE)
dc.titleDesign and Implementation of a High-Field NdFeB Magnet System for Investigating the Spin Seebeck Effect
dc.typeArticle

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