Breakdown of the giant spin model in the magnetic relaxation of the Mn6 nanomagnets.
Breakdown of the giant spin model in the magnetic relaxation of the Mn6 nanomagnets.
复制标题
Mn6 纳米磁体磁弛豫中巨自旋模型的分解。
DOI：
10.1103/physrevlett.100.157203
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发表时间：
2008
影响因子：
8.6
通讯作者：
E. Brechin
中科院分区：
文献类型：
--
作者：
S. Carretta;Tatiana Guidi;P. Santini;G. Amoretti;O. Pieper;B. Lake;J. Slageren;F. E. Hallak;W. Wernsdorfer;H. Mutka;Margarita Russina;C. J. Milios;E. Brechin
利用非弹性中子散射、磁共振波谱和磁强计研究了高各向异性Mn6纳米磁体的自旋动力学。我们表明，对于这些系统来说，一个巨大的自旋图像是完全不够的，激发的S多重态在确定磁化反转的有效能量势垒方面起着关键作用。此外，我们还证明了隧穿过程的发生，涉及具有不同总自旋的态对。
We study the spin dynamics in two variants of the high-anisotropy Mn6 nanomagnet by inelastic neutron scattering, magnetic resonance spectroscopy and magnetometry. We show that a giant-spin picture is completely inadequate for these systems and that excited S multiplets play a key role in determining the effective energy barrier for the magnetization reversal. Moreover, we demonstrate the occurrence of tunneling processes involving pair of states having different total spin.