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In a recent Letter [Y.M. Lu et al., Phys. Rev. Lett. 110, 147207 (2013)], Luet al. reported on "ferromagneticlike transport properties" of thin films ofPt, deposited ex situ via sputtering on the ferrimagnetic insulator Y3Fe5O12.The authors found a magnetoresistance in Pt displaying a hysteresiscorresponding to the coercive field of Y3Fe5O12, consistent with the findingsof other groups. While the latter interpreted their data in terms of therecently proposed spin-Hall magnetoresistance, Lu et al. attributed theirobservation to a magnetic proximity effect. To support this interpretation,they measured the X-ray magnetic circular dichroism (XMCD) at the Pt L2,3 edgesfrom a Pt/Y3Fe5O12 sample with a Pt thickness of 1.5 nm and derived an averageinduced magnetic moment of 0.054 Bohr magnetons per Pt atom. This iscontradictory to the results of our previous comprehensive XMCD study of threedifferent Pt/Y3Fe5O12 samples with Pt thicknesses of 3, 7, and 10 nm from whichwe identified an upper limit of (0.003 +/- 0.001) Bohr magnetons per Pt[Gepr\"ags et al., Appl. Phys. Lett. 101, 262407 (2012), arXiv:1211.0916].

Comment on "Pt magnetic polarization on Y3Fe5O12 and magnetotransport characteristics"