Direct evidence for the source of reported magnetic behavior in “CoTe”

Zhang, Zhiwei; Hines, William A.; Budnick, Joseph I.; Perry, David M.; Wells, Barrett O.

doi:10.1063/1.4997161

Title: Direct evidence for the source of reported magnetic behavior in “CoTe”

Journal Article · Fri Dec 22 00:00:00 EST 2017 · AIP Advances

DOI:https://doi.org/10.1063/1.4997161· OSTI ID:1499682

^[1]; Hines, William A. ^[1]; Budnick, Joseph I. ^[1]; Perry, David M. ^[1]; Wells, Barrett O. ^[1]

Univ. of Connecticut, Storrs, CT (United States)

In order to unambiguously identify the source of magnetism reported in recent studies of the Co-Te system, two sets of high-quality, epitaxial CoTe_x films (thickness ≈ 300 nm) were prepared by pulse laser deposition (PLD). X-ray diffraction (XRD) shows that all of the films are epitaxial along the [001] direction and have the hexagonal NiAs structure. There is no indication of any second phase metallic Co peaks (either fcc or hcp) in the XRD patterns. The two sets of CoTex films were grown on various substrates with PLD targets having Co:Te in the atomic ratio of 50:50 and 35:65. From the measured lattice parameters c = 5.396 Å for the former and c = 5.402 Å for the latter, the compositions CoTe_1.71 (63.1% Te) and CoTe_1.76 (63.8% Te), respectively, are assigned to the principal phase. Although XRD shows no trace of metallic Co second phase, the magnetic measurements do show a ferromagnetic contribution for both sets of films with the saturation magnetization values for the CoTe_1.71 films being approximately four times the values for the CoTe_1.76 films. ⁵⁹Co spin-echo nuclear magnetic resonance (NMR) clearly shows the existence of metallic Co inclusions in the films. In conclusion, the source of weak ferromagnetism reported in several recent studies is due to the presence of metallic Co, since the stoichiometric composition “CoTe” does not exist.

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Research Organization:: Univ. of Connecticut, Storrs, CT (United States)

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

Grant/Contract Number:: FG02-00ER45801

OSTI ID:: 1499682

Alternate ID(s):: OSTI ID: 1414605

Journal Information:: AIP Advances, Vol. 7, Issue 12; ISSN 2158-3226

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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