Static and Dynamic Magnetization Study of Artificial Magnetic Quasicrystals

09/10/2013 - 3:30pm to 4:30pm
Speaker(s) / Presenter(s): 
Vinayak Bhat (University of Kentucky)
Type of Event (for grouping events):

Recent advances in nanolithography allow researchers to fabricate artificially tailored magnetic metamaterials. These artificial metamaterials have gathered considerable interest from high tech as well as from basic science community. Although substantial progress has been made in last 15 years or so in the fabrication and the study of different types of magnetic metamaterials, the focus has been limited to only periodic metamaterials. In this seminar, I will present our group’s recent results on novel artificial quasicrystal—Penrose P2 tiling—magnetic metamaterials. In particular, I will show how such complex artificial quasicrystals give reproducible knee anomalies in the DC magnetization—obtained using SQUID magnetometer and static micromagnetic simulations—and their possible dynamic signatures—obtained using ferromagnetic resonance experiment and simulation. Furthermore, I will also discuss occurrences of chiral loops in these metamaterials, and how artificial magnetic quasicrystals can be viewed as a candidate for artificial spin ice and our recent results on that.

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