Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 15, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202000409
Keywords
anisotropy; compensation temperature; Faraday rotation; magneto-optical garnets
Categories
Funding
- NSF through the MRSEC
- National Nano Coordinated Infrastructure Network (NNCI) [1542202]
- Instrumentation and Facilities program of the National Science Foundation, Earth Sciences Division [NSF/EAR 1642268]
- University of Minnesota
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One of the best magneto-optical claddings for optical isolators in photonic integrated circuits is sputter deposited cerium-doped terbium iron garnet (Ce:TbIG) which has a large Faraday rotation (approximate to-3500 degrees cm(-1) at 1550 nm). Near-ideal stoichiometry Ce + TbFe = 0.57 of Ce0.5Tb2.5Fe4.75O12 is found to have a 44 nm magnetic dead layer that can impede the interaction of propagating modes with garnet claddings. The effective anisotropy of Ce:TbIG on Si is also important, but calculations using bulk thermal mismatch overestimate the effective anisotropy. Here, X-ray diffraction measurements yield highly accurate measurements of strain that show anisotropy favors an in-plane magnetization in agreement with the positive magnetostriction of Ce:TbIG. Upon doping TbIG with Ce, a slight decrease in compensation temperature occurs which points to preferential rare-earth occupation in dodecahedral sites and an absence of cation redistribution between different lattice sites. The high Faraday rotation, large remanent ratio, large coercivity, and preferential in-plane magnetization enable Ce:TbIG to be an in-plane latched garnet, immune to stray fields with magnetization collinear to direction of light propagation.
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