Posted on

arXiv preprint: Origin of temperature and field dependence of magnetic skyrmion size in ultrathin nanodots

https://arxiv.org/abs/1706.07569

In collaboration with groups from Spain and Italy we have written a paper on how temperature effects the radius of skyrmions. This is caused by the change in the effective magnetic parameters due to spin fluctuations. We can calculate the temperature dependence of the relevant magnetic parameters such as anisotropy, exchange stiffness and Dzyaloshinskii-Moriya interaction (DMI) using atomistic spin models.

Interestingly, my friend Unai Atxitia was also conducting a very thorough study of the temperature dependence of the DMI (https://arxiv.org/abs/1706.01684). Using different methods and working independently we found the same results for the DMI scaling which is a nice cross check with each other. I highly recommend reading his paper which includes some really interesting details such as an emergent anisotropy contribution from the DMI.

Posted on

arXiv preprint: Non-local magnon transport in the compensated ferrimagnet GdIG

https://arxiv.org/abs/1705.02871

With friends and collaborators at the Walther Meissner Institute (WMI), TU Munich we have written a paper about non-local magnon transport in Gadolinium Iron Garnet. The experimental measurements show quite a complicated behaviour where the non-local signal changing in response to both the external magnetic field strength and the temperature. We show that  different exchange magnon modes of the bulk change frequency in response to the field and temperature depending on their polarization in qualitative agreement with the measurements.

 

Posted on

A reasonably comprehensive OSX backup strategy

It’s good practice to keep backups in different locations to guard against disasters like fire or theft. This is now becoming quite easy to implement using cloud backups. I also use multiple different pieces of software. This may sound a bit paranoid, but it mitigates against lots of nasty possibilities. For example nasty software bugs do happen which can render your backups useless. So there’s more chance of recovering if you have other fallbacks. Different software solutions can also incorporate nice features into your backup strategy such as reducing disruption for your work by having a 1:1 bootable copy of your hard drive.
Below is a brief outline of the different backup methods I’m using and some of the advantages they each bring to the party.

Continue reading “A reasonably comprehensive OSX backup strategy”