# The complex non-collinear magnetic orderings in Ba2YOsO6: A new approach to tuning spin-lattice interactions and controlling magnetic orderings in frustrated complex oxides

## TL;DR

This paper uses first-principles calculations to reveal that non-collinear magnetic orderings are more stable than collinear ones at low temperatures in frustrated oxides, and demonstrates strain as a tuning mechanism.

## Contribution

It introduces a new understanding of magnetic ordering in frustrated oxides and proposes a mechanical method to control these complex magnetic states.

## Key findings

- Non-collinear orderings are more stable than collinear at zero temperature.
- Higher-order exchange interactions drive non-collinear magnetic states.
- Uniaxial strain can switch magnetic orderings in Ba2YOsO6.

## Abstract

Frustrated magnets are one class of fascinating materials that host many intriguing phases such as spin ice, spin liquid and complex long-range magnetic orderings at low temperatures. In this work we use first-principles calculations to find that in a wide range of magnetically frustrated oxides, at zero temperature a number of non-collinear magnetic orderings are more stable than the type-I collinear ordering that is observed at finite temperatures. The emergence of non-collinear orderings in those complex oxides is due to higher-order exchange interactions that originate from second-row and third-row transition metal elements. This implies a collinear-to-noncollinear spin transition at sufficiently low temperatures in those frustrated complex oxides. Furthermore, we find that in a particular oxide Ba$_2$YOsO$_6$, experimentally feasible uniaxial strain can tune the material between two different non-collinear magnetic orderings. Our work predicts new non-collinear magnetic orderings in frustrated complex oxides at very low temperatures and provides a mechanical route to tuning complex non-collinear magnetic orderings in those materials.