FMR-driven spin pumping in Y₃Fe₅O₁₂-based structures

Abstract

Ferromagnetic resonance driven spin pumping, a topic of steadily increasing interest since its emergence over two decades ago, remains one of the most exciting research fields in condensed matter physics. Among the many materials that have been explored for spin pumping, yttrium iron garnet (YIG) is one of the most extensively studied because of its exceptionally low magnetic damping and insulating nature. There is a great amount of literature in the spin pumping and related research fields, too broad for this review to cover. In this Topical Review, we focus on the YIG-based spin pumping results carried out by our groups, including: the mechanism and technical details of our off-axis sputtering technique for the growth of single-crystalline YIG epitaxial films with a high degree ordering, experimental evidence for the high quality of the YIG films, spin pumping results from YIG into various transition metals and their heterostructures, dynamic spin transport in YIG/antiferromagnet hybrid structures, intralayer spin pumping by localized spin wave modes confined by a micromagnetic probe, dynamic spin coupling between YIG and nitrogen-vacancy centers in diamond, parametric spin pumping from high-wavevector spin waves in YIG, and localized spin wave mode behavior in broadly tunable spatially complex magnetic configurations. These results build on the power and versatility of YIG spin pumping to improve our understanding of spin dynamics, spin currents, spin Hall physics, spin-orbit coupling, dynamic magnetic coupling, and the relationship between these phenomena in a broad range of materials, geometries, and settings.

Electrical Switching of Tristate Antiferromagnetic Néel Order in α−Fe2O3 Epitaxial Films

“…Epitaxial α-Fe2O3 films are grown on Al2O3(001) at 500°C, followed by in-situ deposition of a Pt layer on α-Fe2O3 at room temperature using off-axis sputtering. [27][28][29] α-Fe2O3 is a high temperature AFI with a corundum structure as shown in Fig. 1a.…”

Spin Interactions at the Interfaces Ferromagnetic Oxide/Ferromagnetic Intermetallic Superlattice

“…However, not only non-magnetic normal metals can be used as ISHE spin current detectors. In a number of works, it was shown that magnetic metals, such as permalloy Py (NiFe), as well as Fe, Co, Ni can be used as spin current detectors [3][4][5]. TbCo 2 /FeCo structures containing Tb element with a strong spin-orbit interaction (high atomic weight Z) are distinguished by giant magnetostriction, a large value of the magnetomechanical coupling coefficient, controlled induced magnetic anisotropy and the ability to induce spin-orientation transitions by a magnetic field or elastic stresses [6,7].…”

“…Films from Y 3 Fe 5 O 12 (YIG) are very attractive for spintronic structures because of the small magnetic attenuation and the fact that they are an insulator. It was reported that the spin current can be excited in YIG and detected with a Py film [3][4][5].…”

Nonsinusoidal angular dependence of FMR-driven spin current across an antiferromagnet in Y3Fe5O12/NiO/PtCheng1, Zarzuela2, Brangham3 et al. 2019Phys. Rev. BSelf Cite9030View full textAdd to dashboardCite

“…YIG(35 nm)/NiO(t NiO )/Pt(5 nm) trilayers were deposited using off-axis sputtering on Gd 3 Ga 5 O 12 (GGG) (111) substrates [19]. (111)-textured NiO layers with thicknesses from 0.5 to 40 nm were grown at RT [10].…”

“…The very large V ISHE = 2.38 mV provides a dynamic range of four orders of magnitude for this study. Since for YIG 4πM s < H res and M essentially follows (but lags behind) H, a (quasi-)sinusoidal dependence of V ISHE on θ H is expected, which is regarded as a signature of spin pumping [19].…”