Abstract
The magnetic proximity effect in Pt and W thin films grown on Dy3Fe5O12 (DyIG) is examined at temperatures above and below the magnetic compensation temperature of the ferrimagnetic insulator. Polarized neutron reflectometry indicates that the proximity effect is positive in Pt/DyIG both above and below the compensation temperature, and x-ray magnetic circular dichroism shows a weak positive W magnetization below compensation in W/DyIG. This demonstrates a qualitative difference compared to heavy metal/ferrimagnetic rare earth-transition metal alloys, where the proximity-induced magnetism of the heavy metal changes sign at the compensation temperature. Reflectometry, structural, and spin transport measurements show that depositing the heavy metal film on the ferrimagnetic insulator in situ without breaking vacuum avoids the formation of a low density interfacial layer between the Pt and DyIG.
| Original language | English (US) |
|---|---|
| Article number | 094403 |
| Journal | Physical Review B |
| Volume | 104 |
| Issue number | 9 |
| DOIs | |
| State | Published - Sep 1 2021 |
Bibliographical note
Funding Information:The authors thank Prof. R. Kawakami for helpful discussions. We gratefully acknowledge partial support from NSF Grant No. DMR-1808190, DARPA TEE Program, and SMART, an nCORE Center of the Semiconductor Research Corporation. This work made use of the Shared Experimental Facilities supported in part by the MRSEC Program of the National Science Foundation under Award No. DMR-1419807. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Certain commercial equipment and instruments are identified in this paper to foster understanding. Such identification does not imply recommendation or endorsement by the National Institute of Standards and Technology, nor does it imply that the equipment identified is necessarily the best available for the purpose.
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© 2021 American Physical Society.