DataVXAPL MaterialsPaper
journal article·2017-02-01Open access

Spin Seebeck effect in insulating epitaxial γ−Fe2O3 thin films

P. Jiménez-Cavero, I. Lucas, A. Anadón, R. Ramos, T. Niizeki, M. H. Aguirre, P. A. Algarabel, K. Uchida, M. R. Ibarra, E. Saitoh, L. Morellón

APL Materials· Volume 5· Issue 2
Publisher pageOpen full text
Source abstract

Abstract

We report the fabrication of high crystal quality epitaxial thin films of maghemite (γ−Fe2O3), a classic ferrimagnetic insulating iron oxide. Spin Seebeck effect (SSE) measurements in γ−Fe2O3/Pt bilayers as a function of sample preparation conditions and temperature yield a SSE coefficient of 0.5(1) μV/K at room temperature. Dependence on temperature allows us to estimate the magnon diffusion length in maghemite to be in the range of tens of nanometers, in good agreement with that of conducting iron oxide magnetite (Fe3O4), establishing the relevance of spin currents of magnonic origin in magnetic iron oxides.
Source: crossref · Quality: baseline

Research context

Nanomaterials

OpenAlex topics: Magnetic properties of thin films · Magnetic Properties and Synthesis of Ferrites · Iron oxide chemistry and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Universidad de Zaragoza 1 Instituto de Nanociencia de Aragón, , 50018 Zaragoza, Spain

Universidad de Zaragoza 2 Departamento de Física de la Materia Condensada, , 50009 Zaragoza, Spain

Fundación INA 3 , 50018 Zaragoza, Spain

Tohoku University 4 WPI Advanced Institute for Materials Research, , Sendai 980-8577, Japan

Universidad de Zaragoza 5 Laboratorio de Microscopías Avanzadas, , 50018 Zaragoza, Spain

Universidad de Zaragoza and Consejo Superior de Investigaciones Científicas 6 Instituto de Ciencia de Materiales de Aragón, , E-50009 Zaragoza, Spain

National Institute for Materials Science 7 , Tsukuba 305-0047, Japan

Japan Science and Technology Agency 8 PRESTO, , Saitama 332-0012, Japan

Tohoku University 9 Institute for Materials Research, , Sendai 980-8577, Japan

Japan Atomic Energy Agency 10 Advanced Science Research Center, , Tokai 319-1195, Japan

Funding

Gobierno Regional de Aragón · Japan Science and Technology Agency · Ministerio de Economía y Competitividad · Ministerio de Educación, Cultura y Deporte · Ministry of Education, Culture, Sports, Science and Technology

References (36)

Show source-provided references
1. Spin caloritronics10.1038/nmat3301 ↗
2. Observation of the spin Seebeck effect10.1038/nature07321 ↗
3. Theory of magnon-driven spin Seebeck effect10.1103/PhysRevB.81.214418 ↗
4. Theory of the spin Seebeck effect10.1088/0034-4885/76/3/036501 ↗
5. Landau-Lifshitz theory of the longitudinal spin Seebeck effect10.1103/PhysRevB.88.064408 ↗
6. Magnon spin-current theory for the longitudinal spin-Seebeck effect10.1103/PhysRevB.89.014416 ↗
7. Bulk magnon spin current theory for the longitudinal spin Seebeck effect10.1016/j.jmmm.2015.07.102 ↗
8. Length scale of the spin Seebeck effect10.1103/PhysRevLett.115.096602 ↗
9. Spin Seebeck effect in a weak ferromagnet10.1063/1.4953229 ↗
10. Paramagnetic spin Seebeck effect10.1103/physrevlett.114.186602 ↗
11. Influence of thickness and interface on the low-temperature enhancement of the spin seebeck effect in YIG films10.1103/physrevx.6.031012 ↗
12. Origin of the spin Seebeck effect in compensated ferrimagnets10.1038/ncomms10452 ↗
13. Longitudinal spin Seebeck effect: From fundamentals to applications10.1088/0953-8984/26/34/343202 ↗
14. Thermoelectric performance of spin Seebeck effect in Fe3O4/Pt-based thin film heterostructures10.1063/1.4950994 ↗
15. Thermoelectric generation based on spin Seebeck effects10.1109/JPROC.2016.2535167 ↗
16. Observation of the spin Seebeck effect in epitaxial Fe3O4 thin films10.1063/1.4793486 ↗
17. Unconventional scaling and significant enhancement of the spin Seebeck effect in multilayers10.1103/physrevb.92.220407 ↗
18. Observation of longitudinal spin-Seebeck effect in magnetic insulators10.1063/1.3507386 ↗
19. Anomalous Nernst effect of Fe3O4 single crystal10.1103/PhysRevB.90.054422 ↗
20. Spin Hall effects in metals10.1109/tmag.2013.2262947 ↗
21. Vacancy ordering and electronic structure of γ -Fe2O3 (maghemite): A theoretical investigation10.1088/0953-8984/22/25/255401 ↗
22. Polymorphous transformations of nanometric iron(III) oxide: A review10.1021/cm200397g ↗
23. Iron vacancy ordered γ-Fe2O3 (001) epitaxial films: The crystal structure and electrical resistivity10.1143/JPSJ.75.054708 ↗
24. The little maghemite story: A classic functional material10.1002/1616-3028(200102)11:1<27::AID-ADFM27>3.0.CO;2-X ↗
25. Epitaxial growth of c-Fe2O3 thin films on MgO substrates by pulsed laser deposition and their properties10.1016/j.actamat.2012.10.003 ↗
26. Vibrational spectroscopic characterization of hematite, maghemite, and magnetite thin films produced by vapor deposition10.1021/am1004943 ↗
27. Calculation of multiplet structure of core p-vacancy levels10.1103/PhysRevB.12.15 ↗
28. Resolving surface chemical states in XPS analysis of first row transition metals, oxides and hydroxides: Cr, Mn, Fe, Co and Ni10.1016/j.apsusc.2010.10.051 ↗
29. Atomic-oxygen-assisted MBE growth of α-Fe2O3 on α-Al2O3(0001): Metastable FeO(111)-like phase at subnanometer thicknesses10.1103/PhysRevB.60.14387 ↗
30. Analysis of XPS spectra of Fe2+ and Fe3+ ions in oxide materials10.1016/j.apsusc.2007.09.063 ↗
31. Photoemission satellites and electronic structure of Fe2O310.1103/PhysRevB.34.7318 ↗
32. Fabrication of ultrathin epitaxial γ-Fe2O3 films by reactive sputtering10.1088/0022-3727/44/7/075003 ↗
33. On the discrimination between magnetite and maghemite by XANES measurements in fluorescence mode10.1088/0957-0233/23/1/015602 ↗
34. Microstructure and optical properties of pulsed-laser-deposited iron oxide films10.1109/TMAG.2004.827215 ↗
35. Critical suppression of spin Seebeck effect by magnetic fields10.1103/PhysRevB.92.064413 ↗
36. Characteristic length scale of the magnon accumulation in Fe3O4/Pt bilayer structures10.1063/1.4955031 ↗