C60 fast ions cluster creates surface nano-hillocks on the yttrium iron garnet (Y3Feretrieve&_eid=1-s2.0-S0375960116312786&_mathId=si1.gif&_user=111111111&_pii=S0375960116312786&_rdoc=1&_issn=03759601&md5=5cffb6a0dd87acb477a1e4ace8d62a9f">rey_pxl.gif" data-inlimgeid="1-s2.0-S0375960116312786-si1.gif">) material.
The surface nano-hillocks are explained by plasma expansion approach.
Increasing the temperature (density) ratios make the self-similar expansion region shorter (taller).