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We use the thickness of Cu layers to control all-optical switching ofmagnetization in adjacent Gd$_{24}$(Fe$_9$0Co$_{10}$)$_{76}$ films. Whileincreasing the Cu thickness from 5 to 900nm has no effect on the switchingthreshold, it significantly enlarges the fluence and pulse duration at whichmultiple domains emerge. Having shown that thermally activated multi-domainformation limits the maximum fluence and pulse duration for controlledswitching, we demonstrate that continuous magnetization reversal precedesmulti-domain formation in Gd$_{18}$Dy$_4$Co$_{78}$ films excited with fluencesslightly larger than the multi-domain threshold.

Extending the scope and understanding of all-optical magnetization switching in Gd-based alloys by controlling the underlying temperature transients