The spin Seebeck effect (SSE) is an emergent thermoelectric phenomenon, which enables a thermal-to-electrical energy conversion via the thermal injection of spin currents from a ferromagnet (FM) into an attached paramagnetic metal (PM). Recent studies have revealed that the SSE is very sensitive to the PM/FM interface condition, suggesting a potential way to enhance the SSE by controlling the interface condition. However, most of the previous studies are limited to conventional Pt/bulk single-crystal or thin-film YIG systems, lacking consideration for mesoscale surface defects such as pores and grain grooves, which frequently exist in more prevalent bulk polycrystalline magnets. Here, we investigate the effect of interface condition on the longitudinal SSE (LSSE) in a Pt/polycrystalline NiFe2O4 (NFO) slab system. Different interface conditions are induced by treating the surface of NFO slabs with varying combinations of polishing force (Fp) and post-annealing temperature (Ta) before the Pt deposition. The resultant LSSE signals show strong correlations with different interface parameters. In particular, we find that mesoscale surface defects (cracks, pores, and grain grooves) and the surface roughness play a crucial role in determining the magnitude of LSSE signals and demonstrate that those parameters can be deliberately controlled by properly choosing Fp and Ta. We report one sample with a spin Seebeck coefficient of 0.58 μV/K, which is significantly larger than that of bulk polycrystalline magnets reported thus far.
Skip Nav Destination
,
,
Article navigation
24 February 2020
Research Article|
February 27 2020
Enhancing the spin Seebeck effect by controlling interface condition in Pt/polycrystalline nickel ferrite slabs
Minyoung Kim
;
Minyoung Kim
1
Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH)
, Pohang 37673, South Korea
Search for other works by this author on:
Sang J. Park
;
Sang J. Park
1
Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH)
, Pohang 37673, South Korea
Search for other works by this author on:
Hyungyu Jin
Hyungyu Jin
a)
1
Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH)
, Pohang 37673, South Korea
a)Author to whom correspondence should be addressed: [email protected]
Search for other works by this author on:
Minyoung Kim
Sang J. Park
Hyungyu Jin
a)
1
Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH)
, Pohang 37673, South Korea
a)Author to whom correspondence should be addressed: [email protected]
J. Appl. Phys. 127, 085105 (2020)
Article history
Received:
December 16 2019
Accepted:
February 10 2020
Citation
Minyoung Kim, Sang J. Park, Hyungyu Jin; Enhancing the spin Seebeck effect by controlling interface condition in Pt/polycrystalline nickel ferrite slabs. J. Appl. Phys. 24 February 2020; 127 (8): 085105. https://doi.org/10.1063/1.5142671
Download citation file:
Pay-Per-View Access
$40.00
Sign In
You could not be signed in. Please check your credentials and make sure you have an active account and try again.
Citing articles via
A step-by-step guide to perform x-ray photoelectron spectroscopy
Grzegorz Greczynski, Lars Hultman
Piezoelectric thin films and their applications in MEMS: A review
Jinpeng Liu, Hua Tan, et al.
Decoding diffraction and spectroscopy data with machine learning: A tutorial
D. Vizoso, R. Dingreville
Related Content
Evaluation of thermal gradients in longitudinal spin Seebeck effect measurements
J. Appl. Phys. (April 2015)
Probing the temperature-dependent magnetic anisotropy and longitudinal spin Seebeck effect in Y3Fe5O12
AIP Advances (January 2017)
Fabrication of yttrium–iron–garnet/Pt multilayers for the longitudinal spin Seebeck effect
Appl. Phys. Lett. (December 2018)
Thermally generated magnonic spin currents in a polycrystalline gadolinium iron garnet thin film with perpendicular magnetic anisotropy
J. Appl. Phys. (March 2024)
Negative spin Hall angle and large spin-charge conversion in thermally evaporated chromium thin films
J. Appl. Phys. (March 2022)