Spin dynamics in molecular ring nanomagnets: Significant effect of acoustic phonons and magnetic anisotropies
Abstract
The nuclear spin-lattice relaxation rate 1/T1 is calculated for magnetic ring clusters by fully diagonalizing their microscopic spin Hamiltonians. Whether the nearest-neighbor exchange interaction J is ferromagnetic or antiferromagnetic, 1/T1 versus temperature T in ring nanomagnets may be peaked at around kBT=|J| provided the lifetime broadening of discrete energy levels is in proportion to T3. Experimental findings for ferromagnetic and antiferromagnetic CuII rings are reproduced with crucial contributions of magnetic anisotropies as well as acoustic phonons.
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