Tuning interfacial Dzyaloshinskii-Moriya interactions in thin amorphous ferrimagnetic alloys

Abstract

Skyrmions can be stabilized in magnetic systems with broken inversion symmetry and chiral interactions, such as Dzyaloshinskii-Moriya interactions (DMI). Further, compensation of magnetic moments in ferrimagnetic materials can significantly reduce magnetic dipolar interactions, which tend to favor large skyrmions. Tuning DMI is essential to control skyrmion properties, with symmetry breaking at interfaces offering the greatest flexibility. However, in contrast to the ferromagnet case, few studies have investigated interfacial DMI in ferrimagnets. Here we present a systematic study of DMI in ferrimagnetic CoGd films by Brillouin light scattering. We demonstrate the ability to control DMI by the CoGd cap layer composition, the stack symmetry and the ferrimagnetic layer thickness. The DMI thickness dependence confirms its interfacial nature. In addition, magnetic force microscopy reveals the ability to tune DMI in a range that stabilizes sub-100 nm skyrmions at room temperature in zero field. Our work opens new paths for controlling interfacial DMI in ferrimagnets to nucleate and manipulate skyrmions.

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Cited by in corpus (12)

• Computing and Memory Technologies based on Magnetic Skyrmions
• Spin-orbit coupling in single layer ferrimagnets: direct observation of spin-orbit torques and chiral spin textures
• Tuning Dzyaloshinskii-Moriya Interaction in Ferrimagnetic GdCo: A First Principles Approach
• Tunable Magnetic Skyrmions in Ferrimagnetic Mn${}_4$N
• Rare-earth-free ferrimagnetic Mn4N sub-20 nm thin films as high-temperature spintronic material
• Nonreciprocal spin-wave dispersion in magnetic bilayers
• Ferrimagnet GdFeCo characterization for spin-orbitronics: large field-like and damping-like torques
• Interfacial Mixing Effect in a Promising Skyrmionic Material: Ferrimagnetic Mn${}_4$N
• Magneto-transport and magnetic textures in Ho/FeCoGd/β-W multilayers
• Brillouin Light Scattering from Quantized Spin Waves in Nanowires with Antisymmetric Exchange Interactions
• Role of magnetic anisotropy constant orders and thermal noise on skyrmion formation in the Co/Pt square nanostructure
• Positional stability of skyrmions in a racetrack memory with notched geometry