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Asymmetric magnetic relaxation behavior of domains and domain walls observed through the FeRh first-order metamagnetic phase transition

DOI: 10.1103/PhysRevB.102.144304 DOI Help

Authors: Jamie R. Massey (University of Leeds) , Rowan C. Temple (University of Leeds) , Trevor P. Almeida (University of Glasgow) , Ray Lamb (University of Glasgow) , Nicolas A. Peters (University of Leeds) , Richard P. Campion (University of Nottingham) , Raymond Fan (Diamond Light Source) , Damien Mcgrouther (University of Glasgow) , Stephen Mcvitie (University of Glasgow) , Paul Steadman (Diamond Light Source) , Christopher H. Marrows (University of Leeds)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 102

State: Published (Approved)
Published: October 2020
Diamond Proposal Number(s): 17439 , 18484

Abstract: The phase coexistence present through a first-order phase transition means there will be finite regions between the two phases where the structure of the system will vary from one phase to the other, known as a phase boundary wall. This region is said to play an important but unknown role in the dynamics of the first-order phase transitions. Here, by using both x-ray photon correlation spectroscopy and magnetometry techniques to measure the temporal isothermal development at various points through the thermally activated first-order metamagnetic phase transition present in the near-equiatomic FeRh alloy, we are able to isolate the dynamic behavior of the domain walls in this system. These investigations reveal that relaxation behavior of the domain walls changes when phase coexistence is introduced into the system and that the domain-wall dynamics is different to the macroscale behavior. We attribute this to the effect of the exchange coupling between regions of either magnetic phase changing the dynamic properties of domain walls relative to bulk regions of either phase. We also believe this behavior comes from the influence of the phase boundary wall on other magnetic objects in the system.

Journal Keywords: Exchange interaction; Jamming; Magnetic interactions; Magnetic phase transitions; Magnetization dynamics; Phase transitions

Subject Areas: Materials, Physics

Instruments: I10-Beamline for Advanced Dichroism

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