Helium Ions Put Magnetic Skyrmions on the Track

Juge, Roméo; Bairagi, Kaushik; Rana, Kumari Gaurav; Vogel, Jan; Sall, M.; Mailly, D.; Pham, Van Tuong; Zhang, Qiang; Sisodia, Naveen; Foerster, Michael; Aballe, Lucía; Belmeguenai, M.; Roussigné, Y.; Auffret, S.; Buda-Prejbeanu, L. D.; Gaudin, Gilles; Ravelosona, D.; Boulle, Olivier

doi:10.1021/acs.nanolett.1c00136

Cited by 116 publications

(125 citation statements)

References 75 publications

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“…Such a behavior could be ascribed to the intermixing caused by IR, consistently with the results of recent ab initio calculations that predict a reduction of the DMI strength exactly because of intermixing at the Pt/Co interface 48 . A similar decrease with the He irradiation was experimentally observed in Pt/Co/MgO 24 and W/CoFeB/MgO 32 ultrathin films, although an increase was reported in Ta/CoFeB/Pt 29 and Ta/CoFeB/MgO 27 , 49 . Different materials used can lead to very different interfacial structures due to robustness to intermixing, spin-orbit coupling and therefore different DMI behaviour.…”

Section: Discussionsupporting

confidence: 80%

“…For example, their nucleation, stabilisation, size, velocity and skyrmion Hall effect. The irradiation also opens up the possibility of new writing techniques which could be used to fabricate racetracks or logic devices without physically confining skyrmions via sample edges 24 . Traditional lithographic techniques suffer from defects at boundary edges and skyrmions can be attracted to physical edges preventing efficient transport along the racetrack.…”

Section: Discussionmentioning

confidence: 99%

“…However, a method to reliably control the stability of skyrmions and their motion is still missing. One possible tool is the irradiation of magnetic multilayers by light irradiation using helium (He ) ions 24 .…”

Section: Introductionmentioning

confidence: 99%

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Tailoring interfacial effect in multilayers with Dzyaloshinskii–Moriya interaction by helium ion irradiation

Sud

Tacchi

et al. 2021

Sci Rep

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We show a method to control magnetic interfacial effects in multilayers with Dzyaloshinskii–Moriya interaction (DMI) using helium (He$$^{+}$$ + ) ion irradiation. We report results from SQUID magnetometry, ferromagnetic resonance as well as Brillouin light scattering results on multilayers with DMI as a function of irradiation fluence to study the effect of irradiation on the magnetic properties of the multilayers. Our results show clear evidence of the He$$^{+}$$ + irradiation effects on the magnetic properties which is consistent with interface modification due to the effects of the He$$^{+}$$ + irradiation. This external degree of freedom offers promising perspectives to further improve the control of magnetic skyrmions in multilayers, that could push them towards integration in future technologies.

show abstract

Section: Discussionsupporting

confidence: 80%

Section: Discussionmentioning

confidence: 99%

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Tailoring interfacial effect in multilayers with Dzyaloshinskii–Moriya interaction by helium ion irradiation

Sud

Tacchi

et al. 2021

Sci Rep

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“…Ion irradiation induced structural reorganization affects layers and interfaces, resulting in the coercivity and anisotropy eld change 21 , domain wall (DW) pinning site creation 22 , modulating DM Interaction 23 , and performing magnetic skyrmions 24 . This characteristic is also evident in the case of SOT, so it has been observed in various SOT relevant effects such as reduction of switching current by SOT 18 , in uence on DW dynamics 25 , and multi-level state 26 .…”

Section: Introductionmentioning

confidence: 99%

Improved Spin-orbit Torque Induced Magnetization Switching Efficiency by Helium Ion Irradiation

Baek

Kim

et al. 2021

Preprint

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Increasing the efficiency of spin-orbit torque (SOT) is of great interest in spintronics devices because of its application to the non-volatile magnetic random access memory and in-logic memory devices. Accordingly, there are several studies to alter the magnetic properties and reduce the SOT switching current with Helium ion irradiation, but previous researches are focused on its quantitative changes only. Here, the authors observe the reduction of switching current and analyze the origins of Helium ion irradiation induced SOT switching current reduction. The first is from improved spin Hall angle caused by the resistivity change of heavy metal layer and second is from the reduction of surface anisotropy energy at interface between heavy metal and ferromagnet. The result shows that switching current is reduced about ~30.3% at dose of 30 ions/nm2 and relevant parameter change is shown as improved spin Hall angle from 0.096 to 0.132 and reduced anisotropy field from 13.7 to 8.5 kOe. Altogether, the power consumption ratio is calculated based on the derived parameter and result shows that requiring power reaches only 56.0% at 30 ions/nm2. This analysis suggests that more efficient SOT device engineering is possible by Helium ion irradiation.

show abstract

Section: Introductionmentioning

confidence: 99%

Tailoring Interfacial Effect in Multilayers With Dzyaloshinskii-Moriya Interaction by Helium Ion Irradiation

Sud

Tacchi

et al. 2021

Preprint

View full text Add to dashboard Cite

We show a method to control magnetic interfacial effects in multilayers with Dzyaloshinskii-Moriya interaction (DMI) using helium (He+) ion irradiation. We compare results from SQUID magnetometry, ferromagnetic resonance as well as Brillouin light scattering results on multilayers with DMI as a function of irradiation fluence to study the effect of irradiation on the magnetic properties of the multilayers. Our results show clear evidence of the He+ irradiation effects on the magnetic properties which is consistent with interface modification due to the effects of the He+ irradiation. This external degree of freedom offers promising perspectives to further improve the control of magnetic skyrmions in multilayers, that could push them towards integration in future technologies.

show abstract

Helium Ions Put Magnetic Skyrmions on the Track

Abstract: Magnetic skyrmions are deemed to be the forerunners of novel spintronic memory and logic devices. While their observation and their current-driven motion at room temperature have been demonstrated, certain issues regarding their nucleation, stability, 1

Cited by 116 publications

References 75 publications

Tailoring interfacial effect in multilayers with Dzyaloshinskii–Moriya interaction by helium ion irradiation

Tailoring interfacial effect in multilayers with Dzyaloshinskii–Moriya interaction by helium ion irradiation

Improved Spin-orbit Torque Induced Magnetization Switching Efficiency by Helium Ion Irradiation

Tailoring Interfacial Effect in Multilayers With Dzyaloshinskii-Moriya Interaction by Helium Ion Irradiation

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