Journal
PHYSICAL REVIEW APPLIED
Volume 16, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.16.064058
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Funding
- JSPS KAKENHI, Japan [18H01868, 18H04289, 19K15444]
- JST CREST, Japan [JPMJCR1875, JPMJCR17I1]
- JST A-STEP, Japan [JPMJTM 19AV]
- KAKENHI , Japan [15H05868]
- MEXT Q-LEAP , Japan [JPMXS0118067395]
- Grants-in-Aid for Scientific Research [18H01868, 18H04289, 19K15444] Funding Source: KAKEN
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In this study, a thermal magnon current propagating in a magnetic insulator was detected using a quantum sensor based on electron spins associated with N-V centers in diamond. Modified Rabi-oscillation frequencies of N-V spins hosted in a bulk diamond were observed, which were resonantly coupled with coherent magnons propagating over a long distance. This demonstration provides a basis for creating a device platform that hybridizes spin caloritronics and spin qubits.
Currently, thermally excited magnons are being intensively investigated, owing to their potential in computing devices and thermoelectric conversion technologies. We report the detection of a thermal magnon current propagating in a magnetic insulator yttrium iron garnet under a temperature gradient using a quantum sensor: electron spins associated with nitrogen-vacancy (N-V) centers in diamond. A thermal magnon current is observed as modified Rabi-oscillation frequencies of N-V spins hosted in a beam-shaped bulk diamond that is resonantly coupled with coherent magnon propagating over a long distance. Additionally, using a nanodiamond, alteration in N-V spin-relaxation rates, depending on the applied temperature gradient, are observed under nonresonant N-V excitation conditions. The demonstration of probing a thermal magnon current mediated by coherent magnons via N-V spin states serves as a basis for creating a device platform that hybridizes spin caloritronics and spin qubits.
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