Spin Seebeck Effect - JSTRefrigerator . Wine Cellar: ... Thermoelectric module P N . T + ∆T T...
Transcript of Spin Seebeck Effect - JSTRefrigerator . Wine Cellar: ... Thermoelectric module P N . T + ∆T T...
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Spin Seebeck Effect
JST Japan-Spain Collaboration : “Development in Spin Seebeck Devices” Maekawa goup (JAEA), Saitoh group (Tohoku University), Ibarra group (University of Zaragoza).
JST Japan-Spain Meeting (March 5, 2013)
Sadamichi Maekawa Advanced Science Research Center,
Japan Atomic science Agency, Tokai, Japan
New Paradigm for energy harvesting
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JST Japan-Spain Collaboration: “Development in Spin Seebeck Devices” Japanese Team: Maekawa Group (ASRC, JAEA, Tokai): Theory of spin Seebeck effect, Saitoh Group (IMR, Tohoku University, Sendai): Observation of spin Seebeck effect and developmenet in new materials, Spanish Team: Ibarra Group (University of Zaragoza): Development in thin films and devices.
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electron
Spin: ±ħ/2
Charge: e
Spin current
Both spin current and charge current → Spin-electronics (Spintronics)
(usual electronics ← charge current)
Electron:
Charge current
(Current)
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•Seebeck effect :
heat
electricity T
herm
opow
er
Large Seebeck effect (Q) & Small Resistivity (ρ) are required.
Seebeck effect was discovered in 1821.
Energy conversion from heat to electricity:
Thermo-electric material
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•Galileo: NASA's Spacecraft Curiosity,… Radioisotope
Themroelectric Generator
•SEIKO THERMIC •CITIZEN ECO-DRIVE THERMO
(Radioisotope battery, Nuelear battery)
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Thermo-electric materials: Heat→Electricity
Electricity→Heat
Thermo-electric materials: No vibration (no moving part), Easy to miniaturize, Gentle to environment.
Garbage burning plant Heat of car
Refrigerator
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Wine Cellar: no vibration Panasonic’s product:
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spin-Seebeck effect
J J↑ ↓−Spin current:
Electric voltage
“Spin voltage”
Electric current flows!
Spin current flows!
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ASRC Colloquium
=
= +
=
Electric current
Electric current &
Spin current
Spin current
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Charge current Spin current carried by conduction electrons
eJ J J↑ ↓= +
sJ J J↑ ↓= −
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Spin current carried by spin waves
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Spin Seebeck effect
Lower T end Higher T end
Pt: spin detector (4 mm x100 µm x10 nm)
NiFe: thermo-spin generator (4 mm x6 mm x20 nm)
spin Hall effect: ESHE = DISHE Js × σ
magnitude & polarization of Js
K. Uchida et al.: Nature 455, 778 (2008) (Saitoh Group, Maekawa Group)
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YIG: Insulating ferrimagnet
Spin Seebeck effect: A common phenomenon in ferromagnets!!
K. Uchida et al.: Nature Mater. 9, 894 (2010).
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Thermoelectric module
P N
T + ∆T
T
electric current el
ectr
ic
curr
ent electric
current
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Spin Seebeck (thermoelectric) device
Kirihara et al., Nature Materials 11, 686 (2012)
(NEC, Saitoh Gr. Maekawa Gr.)
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Magnetite (Fe3O4)
P. Weiss and R. Forrer, Ann. Phys. 12, 279(1929)
R. W. Millar, J. Am. Chem. Soc. 51, 215(1929)
T. Okamura, Sci. Rep. Tohoku Imp. Univ. 21, 231(1932)
Metal-Insulator Transition at 120K!
insulator Metal
Magnetite thin films Developed by U. of Zaragoza
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R. Ramos et al.: Phys. Rev. B (2013)
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JST Japan-Spain Collaboration: “Development in Spin Seebeck Devices” Japanese Team: Maekawa Group (ASRC, JAEA, Tokai): Theory of spin Seebeck effect, Saitoh Group (IMR, Tohoku University, Sendai): Observation of spin Seebeck effect and developmenet in new materials, Spanish Team: Ibarra Group (University of Zaragoza): Development in thin films and devices.
Spin Seebeck devices with magnetite!!