An integrated approach to doped thin films with strain tunable magnetic anisotropy: Powder synthesis, target preparation and pulsed laser deposition of Bi:YIG

TL;DR

This paper introduces a comprehensive method for synthesizing Bi:YIG thin films with tunable magnetic anisotropy, emphasizing the entire process from nanopowder synthesis to pulsed laser deposition, and demonstrating strain-induced anisotropy control.

Contribution

It presents a novel integrated synthesis and processing approach for Bi:YIG thin films with controllable magnetic anisotropy, highlighting strain effects and thickness-dependent properties.

Findings

Enhanced perpendicular anisotropy due to strain

Tunable anisotropy by adjusting film thickness

Perpendicular anisotropy surpasses shape anisotropy at 3.5 nm

Abstract

We present a synthesis/processing method for fabricating ferrimagnetic insulator (Bi-doped yttrium iron garnet) thin films with tunable magnetic anisotropy. Since the desired magnetic properties rely on controllable thickness and successful doping, we pay attention to the entire synthesis/processing procedure (nanopowder synthesis, nanocrystalline target preparation and pulsed laser deposition (PLD)). Atomically flat films were deposited by PLD on (111)-orientated yttrium aluminum garnet. We show a significant enhancement of perpendicular anisotropy in the films, caused by strain-induced anisotropy. In addition, the perpendicular anisotropy is tunable by decreasing the film thickness and overwhelms the shape anisotropy at a critical thickness of 3.5 nm.