Suppression of Coercivity in Nanoscale Graded Magnetic Materials

Fallarino, Lorenzo; Quintana, Mikel; Rojo, Eva López; Berger, Andreas

doi:10.1103/physrevapplied.16.034038

Cited by 11 publications

(3 citation statements)

References 45 publications

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“…Advances in thin-film fabrication techniques have facilitated recent work on alloy composition-tuned systems in which the magnetic ordering or exchange coupling can be graded throughout the depth of a thin-film structure [21][22][23]. Frequently, polarized neutron reflectometry (PNR) is used to resolve the depth-dependent magnetic properties in these structures [21,22].…”

Section: Introductionmentioning

confidence: 99%

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

Griggs

Bull

Barton

et al. 2022

Phys. Rev. Materials

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We report on the depth-sensitive, temperature-dependent exchange coupling in an FePt/FeRh thin-film exchange-spring structure. The depth-dependent in-plane magnetization is measured as a function of applied magnetic field and sample temperature using polarized neutron reflectometry (PNR). The magnetization 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 characterization, allowing us to determine characteristic length scales over which the exchange-spring mechanism is effective at ambient and elevated temperatures.

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Section: Introductionmentioning

confidence: 99%

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

Griggs

Bull

Barton

et al. 2022

Phys. Rev. Materials

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“…However, when the external magnetic field opposes the magnetization of the FM region, the PM region develops a magnetic moment proportional to its susceptibility. These induced moments decay exponentially with distance away from the interfaces [25]. In this configuration, the magnetization of the FM region becomes antiparallel to the induced PM magnetization.…”

Section: Magnetic Properties Of the Samplesmentioning

confidence: 91%

“…This behavior cannot be solely attributed to superparamagnetic effects as observed in isolated CoFe 2 O 4 particles. To gain insight into this magnetism variation, we investigate the influence of core and shell materials in coaxial nanowires and provide possible explanation about this phenomenon through the lens of magnetic reversal mechanisms [25,26]. Additionally, magnetic impedance measurements are applied to the aligned coaxial nanowires, demonstrating their potential application in magnetic field sensing.…”

Section: Introductionmentioning

confidence: 99%

Conversion of Hard to Soft Magnetic Ferrite Nanowires by Paramagnetic Shielding

Zeng,

Sivanesarajah,

Hartmann

2023

Solids

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In this study, we investigate the magnetization behavior of coaxial nanowires fabricated through the sol-gel electrospinning method. Our analysis uncovers a significant reduction in coercivity for CoFe2O4 nanowires when BaTiO3 is used as the shell material, effectively transforming them from hard to soft magnetic. This intriguing behavior is attributed to the magnetization reversal effect at the interface between ferromagnetic and paramagnetic regions, and it is also observed in NiFe2O4 and Fe2O3 nanowires. Surprisingly, introducing a GdBa2Cu3O7 shell induces a similar effect. Additionally, we employ magnetic impedance measurements on the coaxial nanowires, unveiling their potential for magnetic field sensing applications.

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