Polarized neutron reflectometry characterization of interfacial magnetism in an FePt/FeRh exchange spring

William Griggs; Charlotte Bull; C. W. Barton; Rhys Griffiths; A J Caruana; C.J.  Kinane; Paul Nutter; Thomas Thomson

doi:10.1103/PhysRevMaterials.6.024403

Polarized neutron reflectometry characterization of interfacial magnetism in an FePt/FeRh exchange spring

William Griggs, Charlotte Bull, C. W. Barton, Rhys Griffiths, A J Caruana, C.J. Kinane, Paul Nutter, Thomas Thomson

Science and Technology Facilities Council (STFC - Technology)

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Abstract

We report on the depth-sensitive, temperature-dependent exchange coupling in an FePt/FeRh thin film exchange spring structure. The depth-dependent in-plane magnetisation is measured as a function of applied magnetic field and sample temperature using polarised neutron reflectometry (PNR). The magnetisation profiles are interpreted in terms of the competition between anisotropy, exchange coupling, and dipolar coupling as the FeRh undergoes the magnetic phase transition from antiferromagnetic to ferromagnetic ordering. The PNR data are combined with bulk magnetometry and X-ray characterisation, allowing us to determine characteristic length scales over which the exchange spring mechanism is effective at ambient and elevated temperatures.

Original language	English
Article number	024403
Number of pages	8
Journal	Physical Review Materials
Volume	6
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevMaterials.6.024403
Publication status	Published - 9 Feb 2022

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abstract = "We report on the depth-sensitive, temperature-dependent exchange coupling in an FePt/FeRh thin film exchange spring structure. The depth-dependent in-plane magnetisation is measured as a function of applied magnetic field and sample temperature using polarised neutron reflectometry (PNR). The magnetisation profiles are interpreted in terms of the competition between anisotropy, exchange coupling, and dipolar coupling as the FeRh undergoes the magnetic phase transition from antiferromagnetic to ferromagnetic ordering. The PNR data are combined with bulk magnetometry and X-ray characterisation, allowing us to determine characteristic length scales over which the exchange spring mechanism is effective at ambient and elevated temperatures.",

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AU - Barton, C. W.

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AU - Caruana, A J

AU - Kinane, C.J.

AU - Nutter, Paul

AU - Thomson, Thomas

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Polarized neutron reflectometry characterization of interfacial magnetism in an FePt/FeRh exchange spring

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