Structural and magnetic properties of cobalt iron disulfide (CoxFe1-xS2) nanocrystals

Gabold, Henrik; Luan, Zhongyue; Paul, Neelima; Opel, Matthias; Müller-Buschbaum, Peter; Law, Matt; Paul, Amitesh

doi:10.1038/s41598-018-22996-1

Structural and magnetic properties of cobalt iron disulfide (Co_xFe_1-xS₂) nanocrystals

Journal Article · Mon Mar 19 00:00:00 EDT 2018 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-018-22996-1· OSTI ID:1500211

Gabold, Henrik ^[1]; Luan, Zhongyue ^[2]; Paul, Neelima ^[3]; ^[4]; ^[3]; Law, Matt ^[2]; ^[3]

Technische Univ. Munchen, Garching (Germany); OSTI
Univ. of California, Irvine, CA (United States)
Technische Univ. Munchen, Garching (Germany)
Bayerische Akademie der Wissenschaften, Garching (Germany)

We report on synthesis and investigation of nanocrystalline cobalt-iron-pyrites with an emphasis on nanocrystal structure, morphology and magnetic behavior. The nanocrystals (NCs) were 5–25 nm in diameter as characterized using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). With an increase in Fe fraction, X-ray diffraction and small-angle-X-ray scattering (SAXS) showed a systematic decrease in lattice constant, primary grain/NC size (15 to 7 nm), and nanoparticle (NP) size (70 to 20 nm), respectively. The temperature dependence of the DC magnetization and AC susceptibility versus frequency revealed a number of magnetic phases in Co_xFe_1-xS₂. Samples with x = 1 and x = 0.875–0.625 showed evidence of superspin glass (SSG) behavior with embedded ferromagnetic (FM) clusters of NPs. For x = 0.5, samples retained their mixed phases, but showed superparamagnetic (SPM) behavior with antiferromagnetic clusters suppressing magnetic dipolar interactions. Below x = 0.5, the pyrites show increasing paramagnetic character. We construct a phase diagram, which can be understood in terms of competition between the various dipolar, exchange, inter- and intracluster interactions. Our results suggest that NC size and shape can be tuned to engineer spin-polarized ferromagnetism of n-doped iron pyrite.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Irvine, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: EE0005324

OSTI ID:: 1500211

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 8; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Topologically stable helices in exchange coupled rare-earth/rare-earth multilayer with superspin-glass like ordering Ye, Jingfan; Baldauf, Thomas; Mattauch, Stefan Communications Physics, Vol. 2, Issue 1 https://doi.org/10.1038/s42005-019-0210-0	journal	September 2019

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