Spin Dynamics in Molecular Ring Nanomagnets : Significant Effect of Acoustic Phonons and Magnetic Anisotropies(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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The nuclear spin-lattice relaxation rate 1/T_1 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/T_1 versus temperature T in ring nanomagnets may be peaked at k_B T ≃ |J| provided the lifetime broadening of discrete energy levels is in proportion to T^3. Experimental findings for ferromagnetic and antiferromagnetic Cu^<II> rings are reproduced with crucial contributions of magnetic anisotropies as well as acoustic phonons.
- 社団法人日本物理学会の論文
- 2006-10-15
著者
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YAMAMOTO Shoji
Department of Physics, Hokkaido University
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Hikihara Toshiya
Hokkaido Univ. Sapporo
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Hikihara Toshiya
Department Of Physics Hokkaido University
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Yamamoto Shoji
Hokkaido Univ. Sapporo
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Yamamoto Shoji
Department Of Biological Chemistry And Crest (core Research For Educational Science And Technology)
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