Quenching points of dimeric single-molecule magnets: Exchange interaction effects

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• 作者：J.M. Florez ; Á ; lvaro S. Na ; ñ ; ez ; P. Vargas
• 关键词：Single-molecule magnets ; Spin tunneling ; Spintronic
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2010
• 出版时间：November 2010
• 年：2010
• 卷：322
• 期：22
• 页码：3623-3630
• 全文大小：936 K

文摘

We study the quenched energy-splitting (Δ_E) of a single-molecule magnet (SMM) conformed by two exchange coupled giant-spins. An assessment of two nontrivial characteristics of this quenching is presented: (i) The quenching-points of a strongly exchange-coupled dimer differ from the ones of their respective giant-spin modeled SMM and such a difference can be well described by using the Solari–Kochetov extra phase; (ii) the dependence on the exchange coupling of the magnetic field values at the quenching-points when Δ_E passes from monomeric to dimeric behavior. The physics behind these exchange-modified points, their relation with the Δ_E-oscillations experimentally obtained by the Landau–Zener method and with the diabolical-plane of a SMM, is discussed.