Vibration-induced modulation of magnetic anisotropy in a magnetic molecule
Journal article, 2018

We theoretically analyze the spectrum of a magnetic molecule when its charge and spin can couple to the molecular vibrations. More specifically, we show that the interplay between charge-vibron and spin-vibron coupling leads to a renormalization of the magnetic anisotropy parameters of the molecule. This effect is discussed for a model device consisting of an individual magnetic molecule embedded in a junction. We study the transport properties of the device and illustrate how the differential conductance is affected by the vibrationally induced renormalization of the magnetic anisotropy. Depending on the total molecular spin and the bare (intrinsic) magnetic anisotropy, the induced modulation can lead to visible shifts and crossings in the spectrum, and it can even be the cause of a transport blockade. It is therefore of particular interest to use mechanically controllable break junctions, since in such a case, the relevant coupling between the molecular spin and vibrations can be controlled via deformations of the molecule when stretching or compressing the junction.

phonons

molecular magnets

magnetic tunnel junctions

molecular junctions

magnetic anisotropy

quantum transport

Author

Ahmed Kenawy

KU Leuven

Janine Splettstoesser

Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics

Maciej Misiorny

Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics

Physical Review B - Condensed Matter and Materials Physics

1098-0121 (ISSN)

Vol. 97 23 1-16 235441

Subject Categories

Inorganic Chemistry

Other Physics Topics

Condensed Matter Physics

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

DOI

10.1103/PhysRevB.97.235441

More information

Latest update

9/14/2018