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Repeated uniform switching of the magnetization of thin films offerrimagnetic amorphous Gd$_{x}$(FeCo)$_{1-x}$ in response to single fast laserpulses is well established. Here we report unusual toggle switching in thinfilms of sperimagnetic amorphous Dy$_x$Co$_{1-x}$ and Tb$_x$Co$_{1-x}$ with$\it{x} \simeq$ 0.25 irradiated with single 200 fs pulses of 800 nm laserlight. The samples have strong local random anisotropy due to the non-S staterare earth. The compensation temperature of the films is $\le$ 180 K and theirCurie temperature is $\simeq$ 500 K. They are mostly switched by the firstpulse, and subsequent pulses lead to partial re-switching of a decreasingamount of the irradiated area, with a granular structure of submicron regionsof switched and unswitched material. Individual switched domains about 700 nmin size are observed around the edge of the irradiated spots where the fluenceis at the threshold for switching. Results are discussed in terms of a randomanisotropy model where the ratio of local anisotropy to exchange is temperaturedependent and close to the threshold for strong pinning.

Single-pulse all-optical switching in amorphous Dy$_x$Co$_{1-x}\text{ }$ and Tb$_x$Co$_{1-x}$