Journal
ULTRAMICROSCOPY
Volume 183, Issue -, Pages 104-108Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultramic.2017.03.024
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Funding
- Helmholtz-Zentrum Berlin
- UK EPSRC [EP/K008412/1]
- EPSRC [EP/K008412/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K008412/1] Funding Source: researchfish
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The antiferromagnetic to ferromagnetic phase transition in FeRh can be induced globally by either heating the material above its phase transition temperature or applying a combination of external stimuli (such as mechanical strain, electric/magnetic fields) on the material preheated close to its transition temperature. On the other hand, to locally induce this phase transition is more desirable for applications and requires a confined source of energy such as a focused laser beam. Here we combine laser excitation with X-ray magnetic imaging to determine the effect of laser heating on the local and transient magnetization of FeRh using time-resolved photoelectron emission microscopy. Excitation by an ultrashort laser pulse generates a local ferromagnetic state within 0.6 ns which recovers its initial antiferromagnetic state after a further 2 ns. The form of the domains during the growth and diminution of ferromagnetic ordering suggests an intrinsic speed limit for magnetic and structural changes. (C) 2017 Elsevier B.V. All rights reserved.
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