Exchange bias effect in Au-Fe3O4 dumbbell nanoparticles induced by the charge transfer from gold

Feygenson, Mikhail; Bauer, John C; Gai, Zheng; Marques, Carlos; Aronson, Meigan C.; Teng, Xiaowei; Su, Dong; Stanic, Vesna; Urban, Volker S; Kevin, Beyer; Dai, Sheng

doi:10.1103/PhysRevB.92.054416

Title: Exchange bias effect in Au-Fe₃O₄ dumbbell nanoparticles induced by the charge transfer from gold

Journal Article · Mon Aug 10 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.054416· OSTI ID:1210146

Feygenson, Mikhail ^[1]; Bauer, John C ^[1]; Gai, Zheng ^[1]; Marques, Carlos ^[2]; Aronson, Meigan C. ^[3]; Teng, Xiaowei ^[4]; Su, Dong ^[5]; Stanic, Vesna ^[5]; Urban, Volker S ^[1]; Kevin, Beyer ^[6]; Dai, Sheng ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Stony Brook Univ., NY (United States)
Stony Brook Univ., NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Univ. of New Hampshire, Durham, NH (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

We have studied the origin of the exchange bias effect in the Au-Fe₃O₄ dumbbell nanoparticles in two samples with different sizes of the Au seed nanoparticles (4.1 and 2.7 nm) and same size of Fe₃O₄ nanoparticles (9.8 nm). The magnetization, small-angle neutron scattering, synchrotron x-ray diffraction and scanning transmission electron microscope measurements determined the antiferromagnetic FeO wüstite phase within Fe₃O₄ nanoparticles, originating at the interface with the Au nanoparticles. The interface between antiferromagnetic FeO and ferrimagnetic Fe₃O₄ is giving rise to the exchange bias effect. The strength of the exchange bias fields depends on the interfacial area and lattice mismatch between both phases. We propose that the charge transfer from the Au nanoparticles is responsible for a partial reduction of the Fe₃O₄ into FeO phase at the interface with Au nanoparticles. The Au-O bonds are formed across the interface to accommodate an excess of oxygen released during the reduction of magnetite.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; AC02-06CH11357; AC02-98CH1886

OSTI ID:: 1210146

Alternate ID(s):: OSTI ID: 1209839

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 5; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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Hsiao, C. -H.; Chi, C. -C.; Wang, S.; +4 more

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77 NANOSCIENCE AND NANOTECHNOLOGY

Title: Exchange bias effect in Au-Fe3O4 dumbbell nanoparticles induced by the charge transfer from gold

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