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Element-specific magnetic properties of di-erbium Er-2@C-82 and Er2C2@C-82 metallofullerenes: A synchrotron soft X-ray magnetic circular dichroism study

Okimoto, Haruya and Kitaura, Ryo and Nakamura, Tetsuya and Ito, Yasuhiro and Kitamura, Yutaka and Akachi, Takao and Ogawa, Daisuke and Imazu, Naoki and Kato, Yuko and Asada, Yuki and Sugai, Toshiki and Osawa, Hitoshi and Matsushita, Tomohiro and Muro, Takayuki and Shinohara, Hisanori (2008) Element-specific magnetic properties of di-erbium Er-2@C-82 and Er2C2@C-82 metallofullerenes: A synchrotron soft X-ray magnetic circular dichroism study. JOURNAL OF PHYSICAL CHEMISTRY C, 112 (15). pp. 6103-6109.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp711776j

Abstract

The magnetic properties of mono- and dierbium(Er) metallofullerenes have been studied by means of a synchrotron soft X-ray magnetic circular dichroism (SXMCD) technique. The effective magnetic moment of the Er ions has been estimated to be 8.48 mu(B) and is independent of the number of Er ions encapsulated inside the fullerene cage. These Er metallofullerenes exhibit an anti ferromagnetic-like behavior at low temperatures that is stronger in Er@C-82(C-2 nu isomer) monometallofullerene than in Er-2@C-82(C-2 nu) and Er2C2@C-82(C-2 nu) dimetallofullerenes. The result suggests that the unpaired spin on the monometallofullerene cages causes an indirect magnetic interaction between Er 4f spins of neighboring metallofullerenes. Furthermore, we have found that the Weiss temperatures of the metallofullerene remain the same even when one of the Er ions in Er2C2@C-82(C-s) is replaced by a nonmagnetic Y ion (i.e., ErYC2@C-82). The results indicate that interaction between the two Er ions in the same fullerene cage does not contribute significantly to the overall magnetic properties.

Item Type:Article
Subjects:Material Science > Functional and hybrid materials
Physical Science > Nano objects
Physical Science > Nanomagnetics
ID Code:2879
Deposited By:Farnush Anwar
Deposited On:12 Jan 2009 17:20
Last Modified:23 Jan 2009 12:02

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