Influence of Growth Field on NiFe, Fe$_3$O$_4$, and NiFe/Cr/Fe$_3$O$_4$ Spin-Valves

Jayathilaka, Priyanga; Bauer, C. A.; Williams, D. V.; Miller, Casey W.

doi:10.1109/tmag.2010.2045353

Cited by 5 publications

(5 citation statements)

References 13 publications

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“…The (111) orientation is specifically of interest because it is known to yield the largest exchange bias when using FeMn as the antiferromagnet [12]. Each sample shows without an applied growth field [13]. X-ray reflectivity was used to confirm that the deposition rate was independent of the magnetic field used during deposition.…”

Section: Resultsmentioning

confidence: 99%

“…A custom substrate plate was used to deliver an in-plane field ∼250 Oe in a local region of the plate, while the opposite side of the plate has a field below the detection level of a calibrated Lakeshore 421 Gaussmeter. This allows two control samples of Cu(300 Å)/NiFeCuMo(200 Å)/Cu(300 Å) to be produced simultaneously, one with and one without an applied growth field [13]. X-ray reflectivity was used to confirm that the deposition rate was independent of the magnetic field used during deposition.…”

Section: Resultsmentioning

confidence: 99%

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Exchange bias of mu-metal thin films

Kirby

Eggers

Jayathilaka

et al. 2012

Journal of Magnetism and Magnetic Materials

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The exchange bias of the soft ferromagnet mu-metal, Ni 77 Fe 14 Cu 5 Mo 4 , with the metallic antiferromagnet Fe 50 Mn 50 has been studied as a function of ferromagnet thickness and buffer layer material. Mu-metal exhibits classic exchange bias behavior: the exchange bias (H EB ) and coercive fields scale inversely with the ferromagnet's thickness, with H EB varying as the cosine of the in-plane applied field angle. While the exchange bias, coercivity, and exchange energy are greatest when the buffer layer material is (111) oriented Cu, amorphous Ta buffers allow the mu-metal to retain more of its soft magnetic character. The ability to preserve soft ferromagnetic behavior in an exchange biased heterostructure may be useful for low field sensing and other device applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Exchange bias of mu-metal thin films

Kirby

Eggers

Jayathilaka

et al. 2012

Journal of Magnetism and Magnetic Materials

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“…The Py and Py-Cu alloy layers were grown with RF sputtering with rates in the range 0.2–0.4 Å/s, depending on the target; IrMn and Ta were grown at 1.2 Å/s and 0.8 Å/s, respectively, using 100 W DC. All samples were grown in the presence of a small magnetic field on the substrate plate to induce exchange bias 14 . The Ta was used to prevent oxidation 15 .…”

Section: Fabrication and Methodsmentioning

confidence: 99%

Tunable coupling in magnetic thin film heterostructures with a magnetic phase transition

Repa

Kirby

Miller

2023

Sci Rep

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The magnetic properties of permalloy-based trilayers of the form Py0.8Cu0.2/Py0.4Cu0.6/Py/IrMn were studied as the spacer layer undergoes a paramagnetic to ferromagnetic phase transition. We find the coupling between the free Py0.8Cu0.2 layer and the exchange bias pinned Py to be strongly temperature-dependent: there is negligible coupling above the Curie temperature of the Py0.4Cu0.6 spacer layer, strong ferromagnetic coupling below that temperature, and a tunable coupling between these extremes. Polarized neutron reflectometry was used to measure the depth profile of the magnetic order in the system, allowing us to correlate the order parameter with the coupling strength. The thickness dependence shows that these are interface effects with an inverse relationship to thickness, and that there is a magnetic proximity effect that enhances the Curie temperature of the spacer layer with characteristic length scale of about 7 nm. As a demonstration of potential functionality of such a system, the structure is shown to spontaneously flip from the antiparallel to parallel magnetic configuration once the spacer layer has developed long-range magnetic order.

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“…The Py and Py-Cu alloy layers were grown with RF sputtering with rates in the range 0.2-0.4 Å/s, depending on the target; IrMn and Ta were grown at 1.2 Å/s and 0.8 Å/s, respectively, using 100 W DC. All samples were grown in the presence of a small magnetic field on the substrate plate to induce exchange bias [13]. The Ta was used to prevent oxidation [14].…”

Section: Fabrication and Methodsmentioning

confidence: 99%

Tunable Coupling in Magnetic Thin Film Heterostructures with a Magnetic Phase Transition

Repa

Kirby²,

Miller

2022

Preprint

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The magnetic properties of permalloy-based trilayers of the form Py0.8Cu0.2/Py0.4Cu0.6/Py/IrMn were studied as the spacer layer undergoes a paramagnetic to ferromagnetic phase transition. We find the coupling between the free Py0.8Cu0.2 layer and the exchange bias pinned Py to be strongly temperature-dependent: there is negligible coupling above the Curie temperature of the Py0.4Cu0.6 spacer layer, strong ferromagnetic coupling below that temperature, with a tunable coupling between these extremes. Polarized neutron reflectometry was used to measure the depth profile of the magnetic order in the system, allowing us to correlate the order parameter with the coupling strength. The thickness dependence shows that these are interface effects with an inverse relationship to thickness, and that there is a magnetic proximity effect that enhances the Curie temperature of the spacer layer with characteristic length scale of about 5 nm. As a demonstration of potential functionality of such a system, the structure is shown to spontaneously flip from the antiparallel to parallel magnetic configuration once the spacer layer has developed long-range magnetic order.

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Influence of Growth Field on NiFe, Fe$_3$O$_4$, and NiFe/Cr/Fe$_3$O$_4$ Spin-Valves

Cited by 5 publications

References 13 publications

Exchange bias of mu-metal thin films

Exchange bias of mu-metal thin films

Tunable coupling in magnetic thin film heterostructures with a magnetic phase transition

Tunable Coupling in Magnetic Thin Film Heterostructures with a Magnetic Phase Transition

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