Design of Face Centered Cubic Co81.8Si9.1B9.1 with High Magnetocrystalline Anisotropy

TL;DR

This paper reports the successful synthesis of a face centered cubic Co81.8Si9.1B9.1 alloy with high magnetocrystalline anisotropy, combining atomic cluster design principles with experimental validation for potential magnetic applications.

Contribution

It introduces a novel FCC Co-based alloy designed from atomic cluster principles, achieving high anisotropy and ductility in crystalline form.

Findings

Achieved single-phase FCC Co81.8Si9.1B9.1 ribbons with ~92 nm grains.

Demonstrated high coercivity of 430 Oe and squareness of 0.82 at room temperature.

Extended atomic cluster model to crystalline alloy design.

Abstract

Despite the composition close to glassy forming alloys, face centered cubic (FCC) Co81.8Si9.1B9.1, designed based on Co9B atomic cluster (polyhedral), are synthesized as singlephase ribbons successfully. These ribbons, with grain sizes of ca. 92 nm, show supreme ductility and strong orientation along (111), which couples with shape anisotropy leading to high magnetocrystalline anisotropy comparable to Co rich Co-Pt nanoscale thin films, with a coercivity of 430 Oe and squareness of 0.82 at room temperature. The stability and magnetic behaviors of the phase are discussed based on experimental electronic structure. This work not only develops low cost Co-based materials for hard magnetic applications, but also extends the atomic cluster model developed for amorphous alloys into the design of new crystalline materials.