Fig. 5: Dependence of ordering on the Co layer thickness and the nanomagnet size observed with MFM. | Communications Engineering

Fig. 5: Dependence of ordering on the Co layer thickness and the nanomagnet size observed with MFM.

From: Perpendicular-anisotropy artificial spin ice with spontaneous ordering: a platform for reservoir computing with flexible timescales

Fig. 5

All systems were initialized to a uniform magnetic state (black contrast) with an out-of-plane magnetic field before the measurements. a MFM images of lattices with DNM = 200 nm, SASI = 20 nm and increasing Co thickness tCo observed at t ~ 1000 s. Image frame colours correspond to those of the curves in b. White contrast indicates that the nanomagnets have switched. b Energy landscapes calculated for the lattices shown in a. c Average magnetization mavg and local antiferromagnetic parameter qNN as a function of tCo determined from MFM images in a. d MFM images of lattices with DNM = 140 nm and tCo = 1.45 nm observed at t ~ 1000 s and t ~ 7×107 s. The nanomagnets that have switched between the two times are indicated with yellow circles.

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