Size Dependent Enhancement of Spin and Orbital Magnetism in CoRh Nanoparticles

M Muñoz-Navia; J Dorantes-Dávila; C Amiens; B Chaudret; D Zitoun; M.J Casanove; P Lecante; N Jaouen; A Rogalev; M Respaud; G.M Pastor

Size Dependent Enhancement of Spin and Orbital Magnetism in CoRh Nanoparticles

M Muñoz-Navia, J Dorantes-Dávila, C Amiens, B Chaudret, D Zitoun, M.J Casanove, P Lecante, N Jaouen, A Rogalev, M Respaud, G.M Pastor

Department of Chemistry

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

Abstract

The magnetism of CoRh nanoparticles (NPs) is investigated experimentally and theoretically. NPs of about 2 nm diameter have been synthesized by decomposition of organometallic precursors in mild conditions of pressure and temperature, under hydrogen atmosphere and in the presence of a polymer matrix. The magnetic properties are determined by SQUID and X-ray magnetic circular dichroism. All the studied CoRh clusters are magnetic with an average spin moment per atom that is significantly larger than the one of macroscopic crystals or alloys with similar concentrations. The experimental results and the comparison with theory suggest that the most likely chemical arrangement is a Rh core with a Co-rich outer shell and some degree of intermixing at the CoRh interface. A detailed analysis of the theoretical results from a local perspective shows that the spin and orbital moments of the Co and Rh atoms at the interface are largely responsible for the enhancement of the magnetization.

Original language	American English
Journal	MRS Proceedings
Volume	998
State	Published - 2007

Cite this

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title = "Size Dependent Enhancement of Spin and Orbital Magnetism in CoRh Nanoparticles",

abstract = "The magnetism of CoRh nanoparticles (NPs) is investigated experimentally and theoretically. NPs of about 2 nm diameter have been synthesized by decomposition of organometallic precursors in mild conditions of pressure and temperature, under hydrogen atmosphere and in the presence of a polymer matrix. The magnetic properties are determined by SQUID and X-ray magnetic circular dichroism. All the studied CoRh clusters are magnetic with an average spin moment per atom that is significantly larger than the one of macroscopic crystals or alloys with similar concentrations. The experimental results and the comparison with theory suggest that the most likely chemical arrangement is a Rh core with a Co-rich outer shell and some degree of intermixing at the CoRh interface. A detailed analysis of the theoretical results from a local perspective shows that the spin and orbital moments of the Co and Rh atoms at the interface are largely responsible for the enhancement of the magnetization.",

author = "M Mu{\~n}oz-Navia and J Dorantes-D{\'a}vila and C Amiens and B Chaudret and D Zitoun and M.J Casanove and P Lecante and N Jaouen and A Rogalev and M Respaud and G.M Pastor",

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TY - JOUR

T1 - Size Dependent Enhancement of Spin and Orbital Magnetism in CoRh Nanoparticles

AU - Muñoz-Navia, M

AU - Dorantes-Dávila, J

AU - Amiens, C

AU - Chaudret, B

AU - Zitoun, D

AU - Casanove, M.J

AU - Lecante, P

AU - Jaouen, N

AU - Rogalev, A

AU - Respaud, M

AU - Pastor, G.M

PY - 2007

Y1 - 2007

N2 - The magnetism of CoRh nanoparticles (NPs) is investigated experimentally and theoretically. NPs of about 2 nm diameter have been synthesized by decomposition of organometallic precursors in mild conditions of pressure and temperature, under hydrogen atmosphere and in the presence of a polymer matrix. The magnetic properties are determined by SQUID and X-ray magnetic circular dichroism. All the studied CoRh clusters are magnetic with an average spin moment per atom that is significantly larger than the one of macroscopic crystals or alloys with similar concentrations. The experimental results and the comparison with theory suggest that the most likely chemical arrangement is a Rh core with a Co-rich outer shell and some degree of intermixing at the CoRh interface. A detailed analysis of the theoretical results from a local perspective shows that the spin and orbital moments of the Co and Rh atoms at the interface are largely responsible for the enhancement of the magnetization.

AB - The magnetism of CoRh nanoparticles (NPs) is investigated experimentally and theoretically. NPs of about 2 nm diameter have been synthesized by decomposition of organometallic precursors in mild conditions of pressure and temperature, under hydrogen atmosphere and in the presence of a polymer matrix. The magnetic properties are determined by SQUID and X-ray magnetic circular dichroism. All the studied CoRh clusters are magnetic with an average spin moment per atom that is significantly larger than the one of macroscopic crystals or alloys with similar concentrations. The experimental results and the comparison with theory suggest that the most likely chemical arrangement is a Rh core with a Co-rich outer shell and some degree of intermixing at the CoRh interface. A detailed analysis of the theoretical results from a local perspective shows that the spin and orbital moments of the Co and Rh atoms at the interface are largely responsible for the enhancement of the magnetization.

UR - https://scholar.google.co.il/scholar?q=Size+Dependent+Enhancement+of+Spin+and+Orbital+Magnetism+in+CoRh+Nanoparticles&btnG=&hl=en&as_sdt=0%2C5

M3 - Article

VL - 998

JO - MRS Proceedings

JF - MRS Proceedings

ER -

Size Dependent Enhancement of Spin and Orbital Magnetism in CoRh Nanoparticles

Abstract

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