Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 56: Bulk Materials: Soft and hard permanent magnets
MA 56.5: Vortrag
Donnerstag, 23. März 2017, 16:00–16:15, HSZ 403
Ferromagnetism vs. slow relaxation in Fe-doped Li3N — •Manuel Fix1, Rudra S. Manna1, Stephan G. Jantz2, and Anton Jesche1 — 1EP 6, Electronic Correlations and Magnetism, University of Augsburg, Germany — 2Solid State Chemistry, Insitute of Physics, University of Augsburg, Germany
The compounds Li2(Li1−xTx)N where T = {Mn, Fe, Co and Ni} show a highly anisotropic behaviour of their magnetic properties resulting from large orbital contributions to the magnetic moment of the transition metals [1,2]. In the case of Fe-doping, this results in a huge magnetic hysteresis with coercive fields of more than 11 T, tempting one to claim a ferromagnetic behaviour in the compound. On the other hand, Li2(Li1−xFex)N shows a pronounced time dependence of the magnetization, reminiscent of spin glasses or molecular magnets.
We will discuss the intriguing magnetic properties of Li2(Li1−xFex)N. Isothermal magnetisation curves will be compared to direct measurements of the magnetic relaxation, as well as the frequency dependence of the ac-susceptibility.
Furthermore, similarities between the hysteresis in magnetization and magnetostriction are going to be discussed.
A. Jesche et al., Phys. Rev. B 91, 180403(R) (2015)
A. Jesche et al., Nature Comm. 5:3333 (2014)