Spin caloritronics in magnetic/non-magnetic nanostructures and graphene field effect devices

Fasil Dejene

doi:10.1038/nphys2743

Spin caloritronics in magnetic/non-magnetic nanostructures and graphene field effect devices

Fasil Dejene

Fysica van Nano Devices

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In de afgelopen eeuw is er veel vooruitgang geboekt in het begrip van de koppeling tussen ladingsstromen en warmtestromen (thermo-elektriciteit) als ook voor ladingsstromen en spinstromen (spintronica). De combinatie van spintronica en thermo-elektriciteit heeft zeer recent geleid tot het ontstaan van een nieuw veld, genaamd spin caloritronica. Dit proefschrift richt zich op het verkrijgen van meer begrip over verschillende spin caloritronische fenomenen op ferromagnetische/niet-magnetische metalen oppervlakken in pilaar-vormige en laterale (niet-lokale) spinklep devices. In het eerste deel van dit proefschrift wordt het gebruik gemaakt van een multifunctionele nano-pilaar spinklep. Hiermee tonen we zowel het bestaan van warmte-gedreven spinstroombronnen aan, als ook magnetisch controleerbare warmte schakelaren op nanoschaal. Verder laten we zien hoe een magnetisch isolerend substraat, zoals yttrium ijzer granaat (YIG), een spinstroom kan beïnvloeden in niet-lokale spinkleppen. In het laatste hoofdstuk demonstreren we de elektrisch veranderbare aard van thermo-elektrische effecten in grafeen – het één atoomlaag dikke koolstof materiaal – en bevestigen de Thomson relatie tussen het Seebeck en Peltier effect. Tot slot geven we een vooruitblik op de mogelijkheid om spin caloritronica te gebruiken in toekomstige device toepassingen.

Originele taal-2	English
Kwalificatie	Doctor of Philosophy
Toekennende instantie	Rijksuniversiteit Groningen
Begeleider(s)/adviseur	van Wees, Bart, Supervisor
Datum van toekenning	13-apr.-2015
Plaats van publicatie	[Groningen]
Uitgever	University of Groningen
Gedrukte ISBN's	978-90-367-7681-3
Elektronische ISBN's	978-90-367-7680-6
DOI's	https://doi.org/10.1038/nphys2743
Status	Published - 2015

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10.1038/nphys2743

Title and contents Final publisher's version, 476 KB
Chapter 1Final publisher's version, 179 KB
Chapter 2Final publisher's version, 3,35 MB
Chapter 3Final publisher's version, 2,66 MB
Chapter 4Final publisher's version, 3,98 MB
Chapter 5Final publisher's version, 762 KB
Chapter 6Final publisher's version, 1,18 MB
Chapter 7Final publisher's version, 1,6 MB
Appendices Final publisher's version, 0,98 MB
SummaryFinal publisher's version, 125 KB
SamenvattingFinal publisher's version, 77,2 KB
AcknowledgementsFinal publisher's version, 91,9 KB
List of publicationsFinal publisher's version, 69,9 KB
Curriculum VitaeFinal publisher's version, 91,6 KB
Complete dissertationFinal publisher's version, 13 MB
PropositionsFinal publisher's version, 46,5 KB

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title = "Spin caloritronics in magnetic/non-magnetic nanostructures and graphene field effect devices",

abstract = "The past century has seen a great progress in the understanding of the coupled flow of charge and heat (thermoelectricity) as well as charge and spin (spintronics). Very recently, the combination of spintronics and thermoelectricity has led to the birth or a new field dubbed spins caloritronics. This dissertation aims at gaining a deeper understanding of various spin caloritronic phenomena at ferromagnetic/normal metal interfaces in pillar shaped and lateral (nonlocal) spin valve devices. In the first part of the thesis, using a multipurpose nanopillar spin valve, we demonstrate heat-driven spin current sources as well as magnetically controllable nanoscale heat switches. In addition, we show how a magnetic insulating substrate, such as Yttrium iron garnet, can control the flow of spin current in nonlocal spin valves. In the last chapter, we demonstrate the electrically tunable nature of thermoelectric effects in graphene—the one atom thick carbon material—and confirm the Thomson relation between the Seebeck and Peltier effects. Finally, we give an outlook on the prospect of spin caloritronics for future device applications.",

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year = "2015",

doi = "10.1038/nphys2743",

language = "English",

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N2 - The past century has seen a great progress in the understanding of the coupled flow of charge and heat (thermoelectricity) as well as charge and spin (spintronics). Very recently, the combination of spintronics and thermoelectricity has led to the birth or a new field dubbed spins caloritronics. This dissertation aims at gaining a deeper understanding of various spin caloritronic phenomena at ferromagnetic/normal metal interfaces in pillar shaped and lateral (nonlocal) spin valve devices. In the first part of the thesis, using a multipurpose nanopillar spin valve, we demonstrate heat-driven spin current sources as well as magnetically controllable nanoscale heat switches. In addition, we show how a magnetic insulating substrate, such as Yttrium iron garnet, can control the flow of spin current in nonlocal spin valves. In the last chapter, we demonstrate the electrically tunable nature of thermoelectric effects in graphene—the one atom thick carbon material—and confirm the Thomson relation between the Seebeck and Peltier effects. Finally, we give an outlook on the prospect of spin caloritronics for future device applications.

AB - The past century has seen a great progress in the understanding of the coupled flow of charge and heat (thermoelectricity) as well as charge and spin (spintronics). Very recently, the combination of spintronics and thermoelectricity has led to the birth or a new field dubbed spins caloritronics. This dissertation aims at gaining a deeper understanding of various spin caloritronic phenomena at ferromagnetic/normal metal interfaces in pillar shaped and lateral (nonlocal) spin valve devices. In the first part of the thesis, using a multipurpose nanopillar spin valve, we demonstrate heat-driven spin current sources as well as magnetically controllable nanoscale heat switches. In addition, we show how a magnetic insulating substrate, such as Yttrium iron garnet, can control the flow of spin current in nonlocal spin valves. In the last chapter, we demonstrate the electrically tunable nature of thermoelectric effects in graphene—the one atom thick carbon material—and confirm the Thomson relation between the Seebeck and Peltier effects. Finally, we give an outlook on the prospect of spin caloritronics for future device applications.

U2 - 10.1038/nphys2743

DO - 10.1038/nphys2743

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Spin caloritronics in magnetic/non-magnetic nanostructures and graphene field effect devices

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