Investigation of induced Pt magnetic polarization in Pt/Y3Fe5O12 bilayers
Stephan Gepr\"ags, Sibylle Meyer, Stephan Altmannshofer, Matthias, Opel, Fabrice Wilhelm, Andrei Rogalev, Rudolf Gross, Sebastian T. B., Goennenwein
TL;DR
This study investigates whether thin platinum films on yttrium iron garnet exhibit induced magnetic moments using XMCD, finding no detectable magnetic polarization in Pt/Y3Fe5O12 bilayers, unlike in Pt/Fe systems.
Contribution
The paper provides the first XMCD analysis of induced magnetization in Pt/Y3Fe5O12 bilayers, establishing an upper limit for magnetic polarization in these heterostructures.
Findings
No detectable XMCD signal in Pt/Y3Fe5O12 bilayers.
Clear XMCD signal observed in Pt/Fe bilayers.
Upper limit estimated for induced Pt magnetic polarization.
Abstract
Using X-ray magnetic circular dichroism (XMCD) measurements, we explore the possible existence of induced magnetic moments in thin Pt films deposited onto the ferrimagnetic insulator yttrium iron garnet (Y3Fe5O12). Such a magnetic proximity effect is well established for Pt/ferromagnetic metal heterostructures. Indeed, we observe a clear XMCD signal at the Pt L3 edge in Pt/Fe bilayers, while no such signal can be discerned in XMCD traces of Pt/Y3Fe5O12 bilayers. Integrating the XMCD signals allows to estimate an upper limit for the induced Pt magnetic polarization in Pt/Y3Fe5O12 bilayers.
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