Electrical resistivity of thin films of AuCo solid solutions

Henger, U.; Korn, D.

doi:10.1088/0305-4608/11/12/010

Cited by 5 publications

(4 citation statements)

References 17 publications

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“…Nanomaterials possessing combined magnetic and plasmonic properties have recently emerged as enticing functional materials in various applications including cancer detection and treatment, − magnetic resonance imaging, , data storage, and mechanochromic devices . These properties are predominantly achieved with nanoparticles in the Fe 3– x O 4 material system, though Au-Co also demonstrates this bifunctionality, in addition to attractive catalyst capabilities. , The majority of research on Au-Co nanoparticles has been focused on nanoparticles achieved via chemical growth techniques; − recently, functional Au-Co nanoparticles have also been achieved through laser ablation. , Research in the thin-film configuration have been studied as multilayers for data storage, and mixed as-deposited thin films, via evaporation − and sputtering − with much of the focus on the material structure, , which has been observed as a solid solution, amorphous, and a solid solution with interspersed Au and Co particles.…”

Section: Introductionmentioning

confidence: 99%

Magnetic and Optical Properties of Au–Co Solid Solution and Phase-Separated Thin Films and Nanoparticles

Garfinkel

Tang

Pakeltis

et al. 2022

ACS Appl. Mater. Interfaces

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The chemical composition and morphology of Au x Co1–x thin films and nanoparticles are controlled via a combination of cosputtering, pulsed laser-induced dewetting (PLiD), and annealing, leading to tunable magnetic and optical properties. Regardless of chemical composition, the as-deposited thin films and as-PLiD nanoparticles are found to possess a face-centered cubic (FCC) Au x Co1–x solid-solution crystal structure. Annealing results in large phase-separated grains of Au and Co in both the thin films and nanostructures for all chemical compositions. The magnetic and optical properties are characterized via vibrating sample magnetometry (VSM), ellipsometry, optical transmission spectroscopy, and electron energy loss spectroscopy (EELS). Despite the exceptionally high magnetic anisotropy inherent to Co, the presence of sufficient Au (72 atom %) in the Au x Co1–x solid solution results in superparamagnetic thin films. Among the as-PLiD nanoparticle samples, an increased Co composition leads to a departure from traditional ferromagnetism in favor of wasp-waisted hysteresis caused by magnetic vortices. Phase separation resulting from annealing leads to ferromagnetism for all compositions in both the thin films and nanoparticles. The optical properties of Au x Co1–x nanostructures are also largely influenced by the chemical morphology, where the Au x Co1–x intermixed solid solution has significantly damped plasmonic performance relative to pure Au and comparable to pure Co. Phase separation greatly enhances the quality factor, optical absorption, and electron energy loss spectroscopy (EELS) signatures. The enhancement of the localized surface plasmon resonances (LSPRs) scales with the reduction in Co composition, despite EELS evidence that excitation of the Co portions of a nanoparticle can provide a similar, and in some instances enhanced, LSPR resonance compared to Au. This behavior, however, is seemingly limited to the LSPR dipole mode, while higher-order modes are greatly damped by a Co aloof position. This observed magneto-plasmonic functionality and tunability could be applicable in biomedicine, namely, cancer therapeutics.

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Section: Introductionmentioning

confidence: 99%

Magnetic and Optical Properties of Au–Co Solid Solution and Phase-Separated Thin Films and Nanoparticles

Garfinkel

Tang

Pakeltis

et al. 2022

ACS Appl. Mater. Interfaces

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“…I n Au single Co atoms have no magnetic moment and the resistance anomaly depends on the square of the concentration showing that interactions between the Co atoms cause the resistance anomaly. By comparing AuCo [3] and CuCo solid solutions we find that the resistance anomaly is about four times larger for AuCo than for CuCo. The residual resistivity, however, has almost the same value in both cases.…”

Section: Solid Solutionmentioning

confidence: 88%

“…The problem has been regarded with respect to AuCo, Boucai et al [ 2 ] found that single Co atoms in Au have no magnetic moment. The resistance anomaly as a function of Co concentration c varies as c2 for AuCo solid solutions [3].…”

Section: Introductionmentioning

confidence: 99%

Electrical resistivity of CuCo solid solutions at low temperature

Hallbr

Korn

Zibold

1981

Phys. Stat. Sol. (a)

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Metastable CuCo solid solutions are produced by vapour condensation onto a substrate held at 5 K. Co solved in Cu causes a negative temperature coefficient of the electrical resistivity at low temperature (resistance anomaly). The resistance anomaly depends on the square of the Co concentration up to about 3 at% Co. This result agrees with the observation that single Co atoms have no localized magnetic moment in a non‐magnetic host but get a moment by interaction. Annealing the CuCo films to e.g. Ta = 390 K leads to clustering of the Co atoms. With the Co atoms in magnetic clusters, the resistance anomaly varies linearly with Co concentration. The residual resistivity as a function of Co concentration follows straight lines always and the slope of these lines decreases with annealing.

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“…In other systems like AuCo [1,2] and CuCo [3] single atoms of the second component (here Co) do not show a localized magnetic moment. In this case the resistance anomaly varies quadratically with Co concentration [4,5].…”

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confidence: 97%

Low temperature anomaly of the electrical resistivity of SnMn

Korn

Maurer

1983

J. Phys. France

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2014 Mn étant insoluble dans Sn, les deux métaux sont condensés simultanément à partir de la phase vapeur sur un substrat à 5 K. La résistivité électrique de ces films a un coefficient de température négatif (anomalie de résistivité) comme l'effet Kondo de SnMn mentionné par Buckel et al.L'anomalie de résistivité croit avec la concentration de Mn indiquant un moment magnétique localisé. Un maximum de résistivité apparaît au voisinage de 1 % Mn.La température du maximum monte avec la concentration de Mn. Les résultats expérimentaux indiquent que le désordre structurel est favorable pour l'anomalie de la résistivité.

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Electrical resistivity of thin films of AuCo solid solutions

Cited by 5 publications

References 17 publications

Magnetic and Optical Properties of Au–Co Solid Solution and Phase-Separated Thin Films and Nanoparticles

Magnetic and Optical Properties of Au–Co Solid Solution and Phase-Separated Thin Films and Nanoparticles

Electrical resistivity of CuCo solid solutions at low temperature

Low temperature anomaly of the electrical resistivity of SnMn

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