New article in npj spintronics

Our article “Magnetic anisotropy and GGG substrate stray field in YIG films down to millikelvin temperatures” has just been published in npj spintronics!

In this article we explore the modification of spin waves in Yttrium Iron Garnet (YIG) which occurs because the substrate on which YIG is usually grown — Gallium Gadolinium Garnet — becomes magnetic at low temperatures. We show how the demagnetizing field inside the YIG sample is strongly affected by the substrate spontaneous magnetization. This phenomenon poses a challenge for low-temperature quantum magnonics and motivates research on alternative, non-magnetic substrates. This experimental work was led by our experimental colleagues at the Nanomagnetism and Magnonics group at University of Vienna, we explore the interaction of spin waves in YIG.

Picture Credit: Nanomag group, university of Vienna