Heusler alloys for metal spintronics

Abstract

Heusler alloys have been theoretically predicted and experimentally demonstrated to be an ideal spin source due to their half-metallicity at room temperature. The half-metallicity also offers low Gilbert damping constants for fast magnetization reversal with low switching current density. These intrinsic properties can offer better operationability in spin-transfer-torque-based devices. In addition spin–orbit torque can be exerted using Heusler alloys for spin Hall and caloritronic effects. These properties can be precisely controlled by substituting the constituent elements in a Heusler alloy. We review the recent development on these spintronic devices and summarize their future perspectives. Graphical abstract

Magnetic Damping and Dzyaloshinskii–Moriya Interactions in Pt/Co2FeAl/MgO Systems Grown on Si and MgO Substrates

“…Therefore, the development of new materials with high spin polarization, optimized intrinsic damping, and tunable magnetic anisotropy is highly needed. Heusler alloys [ 6 ] are a promising group of materials to achieve low damping in metallic ferromagnets [ 7 , 8 ] used in charge-based spintronic devices. Indeed, these alloys are theoretically predicted to be half-metals (perfectly spin-polarized conduction electrons at Fermi energy) at room temperature, resulting in exceptional performances in spintronic devices.…”

Half‐Metallicity in Ni2XMn Heusler Alloys (X = Fe, Co, Cr): Ab Initio Calculations

“…[5] Although they have been studied for decades, in recent times the Heusler alloys have increased their interest for different recently discovered applications, such as spintronics and magnetocaloric effect, which add to shape-memory properties. [6][7][8][9][10] In recent years, Heusler alloys, where all the element are d-transition metals, are attracting attention because they present interesting mechanical and magnetic properties. [11,12] Particularly, Heusler alloys containing manganese atoms are of interest due to their magnetic behavior, which is dependent on the distance between this atomic species.…”

Galgotias University, Greater Noida

“…4 Among these, Heusler alloys stand out for their ability to exhibit tunable electronic and magnetic properties, making them highly promising candidates for spintronic devices. 5 Recently, a new class of Heusler alloys, called quaternary Heusler alloys drawn significant attention due to their novel spintronic properties. 6-7-8 Equiatomic quaternary Heusler alloys (EQHAs) have general formula XX'YZ, where X, X' and Y are transition metal elements and Z is main group element.…”