Evolution of strain across the magnetostructural phase transition in epitaxial FeRh films on different substrates

Evolution of strain across the magnetostructural phase transition in epitaxial FeRh films on different substrates

Článek WoS

We present a detailed x-ray diffraction study of the structural evolution of epitaxial FeRh films across the temperature-driven phase transition between antiferromagnetic and ferromagnetic order. FeRh films grown onto MgO, W/MgO, and Al2O3 substrates show qualitatively different lattice distortions (tetragonal vs rhombohedral), while keeping a sharp transition above room temperature. Temperature-dependent x-ray reciprocal space mapping reveals the phase-specific crystal structure, giving access to both in-plane and out-of-plane lattice parameters and crystalline coherence lengths across different stages of the phase transition. Diffuse x-ray scattering from relaxed films is treated via a mosaic block model, which provides a robust data fitting scheme. It is found that the ferromagnetic phase fraction can stand a larger amount of strain before completely annihilating and transitioning to the antiferromagnetic phase upon cooling, as compared to heating. This is related to the distinct magnetic exchange correlations in the antiferromagnetic and ferromagnetic parent phases.

We present a detailed x-ray diffraction study of the structural evolution of epitaxial FeRh films across the temperature-driven phase transition between antiferromagnetic and ferromagnetic order. FeRh films grown onto MgO, W/MgO, and Al2O3 substrates show qualitatively different lattice distortions (tetragonal vs rhombohedral), while keeping a sharp transition above room temperature. Temperature-dependent x-ray reciprocal space mapping reveals the phase-specific crystal structure, giving access to both in-plane and out-of-plane lattice parameters and crystalline coherence lengths across different stages of the phase transition. Diffuse x-ray scattering from relaxed films is treated via a mosaic block model, which provides a robust data fitting scheme. It is found that the ferromagnetic phase fraction can stand a larger amount of strain before completely annihilating and transitioning to the antiferromagnetic phase upon cooling, as compared to heating. This is related to the distinct magnetic exchange correlations in the antiferromagnetic and ferromagnetic parent phases.

EXCHANGE SPRING FILMS; FERROMAGNETIC TRANSITION; ALLOYS; FIELD

EXCHANGE SPRING FILMS; FERROMAGNETIC TRANSITION; ALLOYS; FIELD

ARREGI URIBEETXEBARRIA, J.; CAHA, O.; UHLÍŘ, V.

2021

08.05.2020

AMER PHYSICAL SOC

COLLEGE PK

2469-9950

PHYSICAL REVIEW B

101

17

Spojené státy americké

174413-1

174413-14

14

https://journals.aps.org/prb/abstract/10.1103/PhysRevB.101.174413