Polarised neutron reflectometry characterisation 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

Polarised neutron reflectometry characterisation 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

Nano Engineering and Spintronic Technologies

Science and Technology Facilities Council (STFC - Technology)

Research output: Contribution to journal › Article › peer-review

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
Journal	Physical Review Materials
Publication status	Accepted/In press - 24 Jan 2022

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title = "Polarised neutron reflectometry characterisation of interfacial magnetism in an FePt/FeRh exchange spring",

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.",

author = "William Griggs and Charlotte Bull and Barton, {C. W.} and Rhys Griffiths and Caruana, {A J} and C.J. Kinane and Paul Nutter and Thomas Thomson",

year = "2022",

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day = "24",

language = "English",

journal = "Physical Review Materials",

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T1 - Polarised neutron reflectometry characterisation of interfacial magnetism in an FePt/FeRh exchange spring

AU - Griggs, William

AU - Bull, Charlotte

AU - Barton, C. W.

AU - Griffiths, Rhys

AU - Caruana, A J

AU - Kinane, C.J.

AU - Nutter, Paul

AU - Thomson, Thomas

PY - 2022/1/24

Y1 - 2022/1/24

N2 - 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.

AB - 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.

M3 - Article

JO - Physical Review Materials

JF - Physical Review Materials

SN - 2475-9953

ER -

Polarised neutron reflectometry characterisation of interfacial magnetism in an FePt/FeRh exchange spring

Abstract

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