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Single-molecule nanomagnets are the smallest bistable magnets.

Controlling Magnetic Tunneling in Molecular Nanomagnets Jonathan R. Friedman, Amherst College, DMR 0449516. Single-molecule nanomagnets are the smallest bistable magnets. Their magnetic moment can “tunnel” from up to down directions.

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Single-molecule nanomagnets are the smallest bistable magnets.

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  1. Controlling Magnetic Tunneling in Molecular NanomagnetsJonathan R. Friedman, Amherst College, DMR 0449516 • Single-molecule nanomagnets are the smallest bistable magnets. • Their magnetic moment can “tunnel” from up to down directions. • In recent work, being prepared for publication, on a new molecule (synthesized by G. Christou’s group – UFL) the energy barrier between up and down is reduced when a magnetic field is applied perpendicular to these directions (dashed curve, bottom right). As the barrier decreases, the rate for the magnets to flip direction increases in a series of steps and plateaus (top right). Each plateau represents tunneling between a different pair of excited states (horizontal arrows). • This work allows for a precise understanding of the process by which the magnets reverse direction.

  2. Controlling Magnetic Tunneling in Molecular NanomagnetsJonathan R. Friedman, Amherst College, DMR 0449516 Research by Undergraduate Students The research on this project was done almost exclusively by undergraduate students, under the supervision of the PI. Eduardo H. da Silva Neto (Amherst College ’08, top) is working on this project for his senior honors thesis. He participated in all aspects of the experiments including constructing the apparatus (bottom), mounting the sample, building electronics, writing software and data acquisition and analysis. He will present the results of his research in a talk at the 2007 Conference on Magnetism and Magnetic Materials.

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