The 81st JSAP Autumn Meeting, 2020

Presentation information

Oral presentation

10 Spintronics and Magnetics » 10.2 Fundamental and exploratory device technologies for spin

[10p-Z08-1~10] 10.2 Fundamental and exploratory device technologies for spin

Thu. Sep 10, 2020 12:30 PM - 3:30 PM Z08

Shinji Miwa(Univ. of Tokyo), Yuichiro Ando(Kyoto Univ.)

1:30 PM - 1:45 PM

[10p-Z08-4] Observation of standing spin-wave modes in a YIG slab using lock-in thermography

〇(PC)Harish Kumar Choudhary1, Yuta Kainuma1, Takeshi Shimada1, Kunitaka Hayashi1, Ryo Iguchi2, Ken-ichi Uchida2, Toshu An1 (1.JAIST, 2.NIMS)

Keywords:Spin waves, Spintronics, Thermography

Recently, imaging of the thermal heating for propagating spinwaves (SWs) was demonstrated by using infra-red (IR) camera as an effective tool for studying the spin-waves damping phenomena[1, 2]. Using the high sensitive infra-red (IR) camera, the spatial thermal heating profile has been imaged in the ferrimagnetic insulating sample. However, for a detailed analysis of the interaction between spin and heat is required an advanced thermography method such as lock-in thermography (LIT) [3]. In this work, we have used the LIT technique for the magnetostatic backward volume wave (MSBVW) standing spin-wave mode excited in a polycrystalline yttrium iron garnet (YIG) square slab (8mmx 8mmx1mm) enabling more sensitive and spatially resolved heat emission imaging corresponding to standing spin-wave mode patterns.
The YIG slab was placed on a coplanar waveguide to excite the MSBVW spin waves and in plane static magnetic field H = 1050 Oe was applied. At each spin-waves excited frequencies, temperature rises due to the SWs damping are captured. The spatial thermal temperature profile for continuous spin-wave excitation is smeared by heat conduction. In this work, by using the LIT technique, where the frequency domain Fourier transformed thermal heating profile (phase and amplitude) can be obtained, we have observed clear images of MSBVW standing spin-waves modes in the YIG sample, respectively.The observed heat emission pattern is well understood by standing spin-wave mode having a node at the center in parallel to the applied field showing good agreement with an exponential damping factor in the propagating direction. The observation different standing spin-wave modes will be presented.
[1]T. An et al., Nat. Mater. 12549(2013).
[2] T. An et al,. Appl. Phys. Lett.103 052410 (2013).
[3]S.Daimonet al., Nat.Commun. 7 13754 (2016).