Abstract
Investigations of molecular magnets are driven both by prospective applications in future storage technology or quantum computing as well as by fundamental questions. Nowadays numerical simulation techniques and computer capabilities make it possible to investigate spin Hamiltonians with realistic arrangements of local anisotropy tensors. in this contribution I will discuss the magnetic response of a small spin system with special emphasis on non-collinear alignments of the local anisotropy axes.
Highlights
IntroductionSince the early investigations of Mn12-acetate [1], single molecule magnets (SMM) have been at the heart of the investigations of magnetic molecules worldwide
Since the early investigations of Mn12-acetate [1], single molecule magnets (SMM) have been at the heart of the investigations of magnetic molecules worldwide. This is due to their properties which are governed by the anisotropy barrier, as there is observed slow relaxation of the magnetization as well as spin tunneling through the barrier [2,3,4,5]
Numerically exact evaluations of spin Hamiltonians including anisotropic terms turned out to be limited to rather small systems such as for instance an antiferromagnetically coupled Ni4 compound [9,10,11,12], which was investigated in great detail or another but ferromagnetically coupled Ni4 [13]
Summary
Since the early investigations of Mn12-acetate [1], single molecule magnets (SMM) have been at the heart of the investigations of magnetic molecules worldwide This is due to their properties which are governed by the anisotropy barrier, as there is observed slow relaxation of the magnetization as well as spin tunneling through the barrier [2,3,4,5]. Whereas [15] restricts its parameter space to collinear local anisotropy axes, [16] considers non-collinear ones. In this contribution the recently developed procedures will be used to discuss the effect of noncollinear anisotropy axes on the magnetic response of a fictitious molecular compound.
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