Revealing Nanoscale Disorder in 
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Jagt, Johannes W. van der; Jeudy, V.; Thiaville, A.; Sall, M.; Vernier, N.; Diez, L. Herrera; Belmeguenai, M.; Roussigné, Y.; Chérif, S. M.; Fattouhi, Mouad; López-Dı́az, L.; Lamperti, Alessio; Juge, Roméo; Ravelosona, D.

doi:10.1103/physrevapplied.18.054072

Cited by 8 publications

(4 citation statements)

References 58 publications

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“…The major effect of room temperature irradiation has been shown to be improved material uniformity 39 and interface intermixing 17 . In the same way, thermal annealing is widely used to induce crystallization 40 and promote atomic diffusion 41 .…”

Section: Resultsmentioning

confidence: 99%

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Optimization of Permalloy properties for magnetic field sensors using He$^+$ irradiation

Masciocchi¹,

Jagt²,

Syskaki³

et al. 2023

Preprint

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Permalloy, despite being a widely utilized soft magnetic material, still calls for optimization in terms of magnetic softness and magnetostriction for its use in magnetoresistive sensor applications. Conventional annealing methods are often insufficient to locally achieve the desired properties for a narrow parameter range. In this study, we report a significant improvement of the magnetic softness and magnetostriction in a 30 nm Permalloy film after He + irradiation. Compared to the as-deposited state, the irradiation treatment reduces the induced anisotropy by a factor ten and the hard axis coercivity by a factor five. In addition, the effective magnetostriction of the film is significantly reduced by a factor ten -below 1 × 10 −7 -after irradiation. All the above mentioned effects can be attributed to the isotropic crystallite growth of the Ni-Fe alloy and to the intermixing at the magnetic layer interfaces under light ion irradiation. We support our findings with X-ray diffraction analysis of the textured Ni 81 Fe 19 alloy. Importantly, the sizable magnetoresistance is preserved after the irradiation. Our results show that compared to traditional annealing methods, the use of He + irradiation leads to significant improvements in the magnetic softness and reduces strain cross sensitivity in Permalloy films required for 3D positioning and compass applications. These improvements, in combination with the local nature of the irradiation process make our finding valuable for the optimization of monolithic integrated sensors, where classic annealing methods cannot be applied due to complex interplay within the components in the device.

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Section: Resultsmentioning

confidence: 99%

“…Recently 39 , a comparison between ion irradiation and thermal annealing analyzing the microscopic pinning parameters for DW motion has been conducted. In this work, the annealed sample shows strong but widely distributed pinning sites.…”

Section: Resultsmentioning

confidence: 99%

Optimization of Permalloy properties for magnetic field sensors using He$^+$ irradiation

Masciocchi¹,

Jagt²,

Syskaki³

et al. 2023

Preprint

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show abstract

“…In this frame, ion irradiation is an interesting tool since it allows both tuning the magnetic properties of ultrathin films [1][2][3][4][5][6][7][8] and modifying DW dynamics [9,10]. Early studies on Pt/Co/Pt multilayers showed that He + ions with energy in the 30 keV range provoke shortrange (0.2-0.5 nm) atomic displacements through low energy collisions [1,2,11].…”

mentioning

confidence: 99%

“…The resulting Co/Pt intermixing gradually evolves with increasing fluences, therefore tuning the interfacial perpendicular magnetic anisotropy (PMA) [12]. Although ion irradiation has been observed to change the DW dynamics of several ultrathin films in the creep regime [9,10], the microscopic origin of these effects remains an open issue, as ion irradiation may modify both the pinning disorder and the DW magnetic texture (via the film PMA) and thus the DW-disorder interaction.…”

mentioning

confidence: 99%

Control of the interaction between pinning disorder and domain walls in Pt/Co/AlOx ultrathin films by He+ ion irradiation

Balan

Jagt

Garcia

et al. 2023

Applied Physics Letters

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We have studied the effect of He+ irradiation on the dynamics of chiral domain walls in Pt/Co/AlOx trilayers in the creep regime. Irradiation leads to a strong decrease in the depinning field and a non-monotonous change of the effective pinning barriers. The variations of domain wall dynamics result essentially from the strong decrease in the effective anisotropy constant, which increases the domain wall width. The latter is found to present a perfect scaling with the length-scale of the interaction between domain wall and disorder, ξ. On the other hand, the strength of the domain wall–disorder interaction, fpin, is weakly impacted by the irradiation, suggesting that the length-scales of the disorder fluctuation remain smaller than the domain wall width.

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Role of interface intermixing on perpendicular magnetic anisotropy of cobalt-iron-boron alloy

et al. 2023

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Revealing Nanoscale Disorder in W / Co - Fe -
Johannes W. van der Jagt
¹
,
V. Jeudy
²
,
A. Thiaville
³

et al.

Cited by 8 publications

References 58 publications

Optimization of Permalloy properties for magnetic field sensors using He$^+$ irradiation

Optimization of Permalloy properties for magnetic field sensors using He$^+$ irradiation

Control of the interaction between pinning disorder and domain walls in Pt/Co/AlOx ultrathin films by He+ ion irradiation

Role of interface intermixing on perpendicular magnetic anisotropy of cobalt-iron-boron alloy

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Revealing Nanoscale Disorder in W / Co - Fe - Johannes W. van der Jagt1, V. Jeudy2, A. Thiaville3 et al.

Cited by 8 publications

References 58 publications

Optimization of Permalloy properties for magnetic field sensors using He$^+$ irradiation

Optimization of Permalloy properties for magnetic field sensors using He$^+$ irradiation

Control of the interaction between pinning disorder and domain walls in Pt/Co/AlOx ultrathin films by He+ ion irradiation

Role of interface intermixing on perpendicular magnetic anisotropy of cobalt-iron-boron alloy

Contact Info

Product

Resources

About

Revealing Nanoscale Disorder in W / Co - Fe -
Johannes W. van der Jagt
¹
,
V. Jeudy
²
,
A. Thiaville
³

et al.