Susceptibility of Fe atoms in Cu clusters

Rui Zhang; Tom A. George; Parashu Kharel; Ralph Skomski; D. J. Sellmyer

doi:10.1063/1.4799617

Susceptibility of Fe atoms in Cu clusters

Rui Zhang, Tom A. George, Parashu Kharel, Ralph Skomski, D. J. Sellmyer

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

By putting a Kondo system of limited dimension inside an insulating matrix, the Kondo screening cloud is confined by the size of the system. This allows us to distinguish the bulk and nano-particle behaviors of such system. We have investigated the magnetic properties of 0.3 at. Fe-doped Cu clusters with dimensions less than 20 nm embedded in a SiO₂ matrix. The magnetic measurements are consistent with the Kondo interaction, and net antiferromagnetic Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions between several Fe atoms in one cluster are estimated to have a very small effect. To understand the low-temperature susceptibility reduction, we compare Brillouin functions with exact quantum-mechanical solutions for interacting spin-1 particles and with the Kondo predictions for confined nanoparticles.

Original language	English (US)
Article number	17E148
Journal	Journal of Applied Physics
Volume	113
Issue number	17
DOIs	https://doi.org/10.1063/1.4799617
State	Published - May 7 2013

ASJC Scopus subject areas

General Physics and Astronomy

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10.1063/1.4799617

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title = "Susceptibility of Fe atoms in Cu clusters",

abstract = "By putting a Kondo system of limited dimension inside an insulating matrix, the Kondo screening cloud is confined by the size of the system. This allows us to distinguish the bulk and nano-particle behaviors of such system. We have investigated the magnetic properties of 0.3 at. Fe-doped Cu clusters with dimensions less than 20 nm embedded in a SiO2 matrix. The magnetic measurements are consistent with the Kondo interaction, and net antiferromagnetic Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions between several Fe atoms in one cluster are estimated to have a very small effect. To understand the low-temperature susceptibility reduction, we compare Brillouin functions with exact quantum-mechanical solutions for interacting spin-1 particles and with the Kondo predictions for confined nanoparticles.",

author = "Rui Zhang and George, {Tom A.} and Parashu Kharel and Ralph Skomski and Sellmyer, {D. J.}",

note = "Funding Information: This research was supported by NSF MRSEC (R.S.), and DOE (D.J.S.).",

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T1 - Susceptibility of Fe atoms in Cu clusters

AU - Zhang, Rui

AU - George, Tom A.

AU - Kharel, Parashu

AU - Skomski, Ralph

AU - Sellmyer, D. J.

N1 - Funding Information: This research was supported by NSF MRSEC (R.S.), and DOE (D.J.S.).

PY - 2013/5/7

Y1 - 2013/5/7

N2 - By putting a Kondo system of limited dimension inside an insulating matrix, the Kondo screening cloud is confined by the size of the system. This allows us to distinguish the bulk and nano-particle behaviors of such system. We have investigated the magnetic properties of 0.3 at. Fe-doped Cu clusters with dimensions less than 20 nm embedded in a SiO2 matrix. The magnetic measurements are consistent with the Kondo interaction, and net antiferromagnetic Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions between several Fe atoms in one cluster are estimated to have a very small effect. To understand the low-temperature susceptibility reduction, we compare Brillouin functions with exact quantum-mechanical solutions for interacting spin-1 particles and with the Kondo predictions for confined nanoparticles.

AB - By putting a Kondo system of limited dimension inside an insulating matrix, the Kondo screening cloud is confined by the size of the system. This allows us to distinguish the bulk and nano-particle behaviors of such system. We have investigated the magnetic properties of 0.3 at. Fe-doped Cu clusters with dimensions less than 20 nm embedded in a SiO2 matrix. The magnetic measurements are consistent with the Kondo interaction, and net antiferromagnetic Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions between several Fe atoms in one cluster are estimated to have a very small effect. To understand the low-temperature susceptibility reduction, we compare Brillouin functions with exact quantum-mechanical solutions for interacting spin-1 particles and with the Kondo predictions for confined nanoparticles.

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Susceptibility of Fe atoms in Cu clusters

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