Dysprosium Iron Garnet Thin Films with Perpendicular Magnetic Anisotropy on Silicon. (28th November 2019)

• Record Type: Journal Article
• Authors: Bauer, Jackson J.; Rosenberg, Ethan R.; Kundu, Subhajit; Mkhoyan, K. Andre; Quarterman, Patrick; Grutter, Alexander J.; Kirby, Brian J.; Borchers, Julie A.; Ross, Caroline A.
• Is Part Of: Advanced Electronic Materials. Volume 6:Number 1(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-11-28
• Subjects: magnetic insulators -- oxides -- silicon -- spintronics; Materials -- Electric properties -- Periodicals; Materials science -- Periodicals; Magnetic materials -- Periodicals; Electronic apparatus and appliances -- Periodicals; 537
• DOI: 10.1002/aelm.201900820
• Languages: English
• ISSNs: 2199-160X

Abstract

Abstract: Magnetic insulators, such as the rare‐earth iron garnets, are promising materials for energy‐efficient spintronic memory and logic devices, and their anisotropy, magnetization, and other properties can be tuned over a wide range through selection of the rare‐earth ion. Films are typically grown as epitaxial single crystals on garnet substrates, but integration of these materials with conventional electronic devices requires growth on Si. The growth, magnetic, and spin transport properties of polycrystalline films of dysprosium iron garnet (DyIG) with perpendicular magnetic anisotropy (PMA) on Si substrates and as single crystal films on garnet substrates are reported. PMA originates from magnetoelastic anisotropy and is obtained by controlling the strain state of the film through lattice mismatch or thermal expansion mismatch with the substrates. DyIG/Si exhibits large grain sizes and bulk‐like magnetization and compensation temperature. Polarized neutron reflectometry demonstrates a small interfacial nonmagnetic region near the substrate. Spin Hall magnetoresistance measurements conducted on a Pt/DyIG/Si heterostructure demonstrate a large interfacial spin mixing conductance between the Pt and DyIG comparable to other garnet/Pt heterostructures. Abstract : Large grained, polycrystalline films of dysprosium iron garnet (DyIG) on silicon substrates with perpendicular magnetic anisotropy are investigated for applications in spintronics. The spin Hall magnetoresistance and large spin mixing conductance indicate efficient spin transfer at the interface in a Pt/DyIG/Si heterostructure.