Regensburg 2013 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
MA: Fachverband Magnetismus
MA 40: Molecular Magnetism
MA 40.3: Talk
Thursday, March 14, 2013, 15:30–15:45, H23
Exchange-based and single-ion based relaxation of the magnetization in Ni2Dy — •Alexander Sundt1, Amin Khan2, Pascal Wendler1, Yanhua Lan2, Annie K. Powell2, and Oliver Waldmann1 — 1Physikalisches Institut, Universität Freiburg, Germany — 2Institute of Inorganic Chemistry, Karlsruhe Institute of Technologie, Germany
Ever since the discovery of slow relaxation of the magnetization at the molecular scale in Mn12ac scientists focused on increasing the energy barrier for magnetization reversal Ueff in order to lift the single molecule magnet (SMM) behaviour from cryogenic to easier accessible temperatures for possible applications. A promising road to increase Ueff is the incorporation of highly anisotropic magnetic ions such as rare earth ions in heterometallic SMMs. However, using these ions presents novel challenges such as complicated relaxation pathways.
In this talk we present an experimental study by means of AC and DC susceptibility as well as single crystal magnetization measurements on the 3d4f heterometallic SMM Ni2Dy. The data show that the blocking mechanism for magnetization reversal undergoes as function of temperature a crossover from an exchange-based to a single-ion based relaxation mechanism. In contrast to the situation in Co2Dy2, where we could identify the phenomenon for the first time [1], some significant differences are observed, which will be discussed.
[1] K. C. Mondal, A. Sundt, et. al., Angew. Chem. 124, 7668 (2012)