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We report the magnetic field -- temperature ($H-T$) phase diagram ofCa$_{10}$(Pt$_4$As$_8$)[(Fe$_{1-x}$Pt$_x$)$_2$As$_2$]$_5$ ($x\approx 0.05$)single crystals, which consists of normal, vortex liquid, plastic creep andelastic creep phases. The upper critical field anisotropy is determined by aradio frequency technique via the measurements of magnetic penetration depth,$\lambda$. Both, irreversibility line, $H_{irr}(T)$, and flux creep line,$H^{SPM}(T)$, are obtained by measuring the magnetization. We find that$H_{irr}(T)$ is well described by the Lindemann criterion with parameterssimilar to those for cuprates, while small $H^{SPM}(T)$ results in a wideplastic creep regime. The flux creep rates in the elastic creep regime are inqualitative agreement with the collective creep theory for random pointdefects. A gradual crossover from a single vortex to a bundles regime isobserved. Moreover, we obtain $\lambda(4~ \text K) = 260(26)$ nm through thedirect measurement of the London penetration depth by magnetic forcemicroscopy.

Weak pinning and vortex bundles in anisotropic Ca$_{10}$(Pt$_4$As$_8$)[(Fe$_{1-x}$Pt$_x$)$_2$As$_2$]$_5$ single crystals