Magnetization dynamics of Co antidots

Optically Induced Tunable Magnetization Dynamics in Nanoscale Co Antidot Lattices.
Ruma Mandal, Susmita Saha, Dheeraj Kumar, Saswati Barman, Semanti Pal, Kaustuv Das,Arup Kumar Raychaudhuri, Yasuhiro Fukuma, YoshiChika Otani, and Anjan Barman
ACS Nano 6, 3397 (2012)

We report the time-domain measurements of optically induced precessional dynamics in a series of Co antidot lattices with fixed antidot diameter of 100 nm and with varying lattice constants (S) between 200 and 500 nm. For the sparsest lattice, we observe two bands of precessional modes with a band gap, which increases substantially with the decrease in S down to 300 nm. At S = 200 nm, four distinct bands with significant band gaps appear. The numerically calculated mode profiles show various localized and extended modes with the propagation direction perpendicular to the bias magnetic field. We numerically demonstrate some composite antidot structures with very rich magnonic spectra spreading between 3 and
27 GHz based upon the above experimental observation.

Magnonics in antidots with perpendicular magnetization

High-symmetry magnonic modes in antidot lattices magnetized perpendicular to the lattice plane
R. Bali, M. Kostylev, D. Tripathy, A. O. Adeyeye, and S. Samarin
Phys. Rev. B 85, 104414 (2012)

Calculated modal profiles for modes MF, M1, M2, and M3 from Figs. 2 and 3.

Modeling antidots arrays

Micromagnetic modelling of the anisotropy properties of permalloy antidot arrays with hexagonal symmetry.
A Manzin and O Bottauscio
J. Phys. D 45, 095001 (2012)

Magnetic domain configurations at remanent state for an antidot film with hole diameter d = 200 nm and centre-to-centre
nearest-neighbour hole distance T = 500 nm, considering (a) β = 0◦ and (b) β = 90◦.

Magnetization reversal in antidots

Geometry-dependent magnetization reversal mechanism in ordered Py antidot arrays.
K J Merazzo, D C Leitao, E Jiménez, J P Araujo, J Camarero, R P del Real, A Asenjo and M Vázquez
JPD 44, 505001 (2011)

FORC diagrams of films with thickness tPy = 18 nm: (a) continuous film, and arrays of antidots with diameter (b) dp = 35 nm,
(c) dp = 48 nm and (d) dp = 54 nm.

Super domains in antidot lattices

Classification of super domains and super domain walls in permalloy antidot lattices
X. K. Hu, S. Sievers, A. Müller, V. Janke, and H. W. Schumacher
Phys. Rev. B 84, 024404 (2011)

The spin configurations of the lattice with d=80 nm, Sx =350 nm, and Sy =300 nm (a) and close-ups of SD (b),
LE-SDW(c), and HE-SDW(d) obtained numerically. HE-SDWs are indicated by rectangular frames in (a) and (d). LE-SDW is indicated by the dashed line in (c).