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XMCD Study of the Magnetic Exchange Coupling in a Fluoride-Bridged Dy-Cr Molecular Cluster
Jan Dreiser,Cinthia Piamonteze,Frithjof Nolting,Kasper S. Pedersen,Jesper Bendix,Stefano Rusponi,Harald Brune 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.10
We have studied the fluoride-bridged Dy-Cr molecular nanomagnet [Dy(hfac)4-CrF2(py)4]·1/2CHCl3 by x-ray magnetic circular dichroism (XMCD). The obtained element-specific magnetization curves allow for a quantification of the sign and strength of the magnetic exchange coupling between the Dy and the Cr ions. In an effective spin-1/2 formalism only taking into account the ground Kramers doublet of the DyIII ion, we find a coupling strength of jeff,z =–2.3(1) cm−1. Further, we find that the ground Kramers doublet is nearly perfectly axial with geff,z,Dy = 19.6(6) and geff,xy,Dy = 0(2). The coupling value corresponds to a “true”, non-effective isotropic coupling of j = –0.16 cm−1 when taking into account a full J = 15/2 angular momentum. This coupling strength is comparable to that of j = –0.18 cm−1 previously found in the related fluoride-bridged compound Dy-Cr-Dy.