Magnetic Moments and Adiabatic Magnetization of Free Cobalt Clusters | Zendy

Xiaoshan Xu | Zendy; Shuangye Yin | Zendy; Ramiro Moro | Zendy; Walt A. de Heer | Zendy

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Magnetic Moments and Adiabatic Magnetization of Free Cobalt Clusters

Author(s) -

Xiaoshan Xu,

Shuangye Yin,

Ramiro Moro,

Walt A. de Heer

Publication year - 2005

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.95.237209

Subject(s) - magnetization , adiabatic process , condensed matter physics , magnetic moment , cobalt , cluster (spacecraft) , physics , brillouin and langevin functions , magnetic field , paramagnetism , relaxation (psychology) , materials science , atomic physics , quantum mechanics , psychology , social psychology , computer science , metallurgy , programming language

Magnetizations and magnetic moments of free cobalt clusters Co(N) (12 < N < 200) in a cryogenic (25 K < or = T < or = 100 K) molecular beam were determined from Stern-Gerlach deflections. All clusters preferentially deflect in the direction of the increasing field and the average magnetization resembles the Langevin function for all cluster sizes even at low temperatures. We demonstrate in the avoided crossing model that the average magnetization may result from adiabatic processes of rotating and vibrating clusters in the magnetic field and that spin relaxation is not involved. This resolves a long-standing problem in the interpretation of cluster beam deflection experiments with implications for nanomagnetic systems in general.

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