Long-Lived Magnetization in an Atomic Spin Chain Tuned to a Diabolic Point
R.J.G. Elbertse (TU Delft - QN/Otte Lab, Kavli institute of nanoscience Delft)
D. Borodin (Institute for Basic Science (IBS))
J. Oh (Ewha Womans University, Institute for Basic Science (IBS))
T. Ahn (Institute for Basic Science (IBS), Ewha Womans University)
J. Hwang (Ewha Womans University, Institute for Basic Science (IBS))
J.C. Rietveld (Student TU Delft)
A.J. Heinrich (Institute for Basic Science (IBS), Ewha Womans University)
F. Delgado (Universidad de la Laguna)
S. Otte (Kavli institute of nanoscience Delft, TU Delft - QN/Otte Lab)
Y. Bae (Institute for Basic Science (IBS), Ewha Womans University)
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Abstract
Scaling magnets down to where quantum size effects become prominent triggers quantum tunneling of magnetization (QTM), profoundly influencing magnetization dynamics. Measuring magnetization switching in an Fe atomic chain under a carefully tuned transverse magnetic field, we observe a nonmonotonic variation of magnetization lifetimes around a level crossing, known as the diabolic point (DP). Near DPs, local environment effects causing QTM are efficiently suppressed, enhancing lifetimes by three orders of magnitude. Adjusting interatomic interactions further facilitates multiple DPs. Our Letter provides a deeper understanding of quantum dynamics near DPs and enhances our ability to engineer a quantum magnet.
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