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Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling.  This phenomenon, called the Nuclear Overhauser Enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring...
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Enhanced spin Seebeck effect via oxygen manipulation.

Jeong-Mok Kim1, Seok-Jong Kim1,2, Min-Gu Kang1,3

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The Spin Seebeck effect (SSE) can be significantly enhanced by oxidizing the ferromagnet in a device. This breakthrough boosts thermoelectric conversion efficiency by an order of magnitude, paving the way for better waste heat utilization.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • The Spin Seebeck effect (SSE) generates voltage from temperature gradients using magnons.
  • SSE is promising for thermoelectric devices due to its simple geometry for waste heat harvesting.
  • Current SSE applications are limited by low thermoelectric conversion efficiency.

Purpose of the Study:

  • To investigate methods for enhancing the thermoelectric conversion efficiency of the Spin Seebeck effect.
  • To explore the impact of interfacial oxidation on SSE performance in normal metal/ferromagnet/oxide structures.

Main Methods:

  • Fabrication of W/CoFeB/AlOx thin-film structures.
  • Utilizing voltage-induced interfacial oxidation of the CoFeB layer.
  • Measuring the thermoelectric signal generated via SSE.

Main Results:

  • Interfacial oxidation of CoFeB substantially enhanced the SSE signal by an order of magnitude.
  • The enhancement mechanism involves a reduced exchange interaction in the oxidized ferromagnet.
  • This leads to an increased temperature difference between magnons and electrons and/or a magnon chemical potential gradient.

Conclusions:

  • Interfacial oxidation is a viable strategy to significantly improve SSE thermoelectric conversion efficiency.
  • The findings provide a promising pathway for developing more efficient thermoelectric devices based on SSE.
  • This research is expected to stimulate further investigation into optimizing SSE for practical applications.