Influence of ion implantation parameters on the perpendicular magnetic anisotropy of Fe-N thin films with stripe domains

Amarouche, Teyri; Garnier, Lucas; Marangolo, M.; Eddrief, M.; Etgens, V. H.; Fortuna, F.; Sadaoui, Y.; Tamine, M.; Cantin, J. L.; Bardeleben, H. J. von

doi:10.1063/1.4986653

Cited by 11 publications

(12 citation statements)

References 23 publications

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“…Interestingly, dipole-stabilized skyrmions and skyrmion lattices have recently been engineered 29 , 30 in Fe/Gd films and multilayers with PMA but without DMI, upon application of a perpendicular magnetic field. In contrast, in our Fe-N films, the topological defects, in the form of magnetic edge dislocations of the periodic stripe domain pattern, are found to nucleate spontaneously, at room temperature, as remanence is approached 23 . The breaking of long-range order from topological defects in the stripe domain phase can be attributed 9 both to “quenched” disorder (associated with ever-present atomic imperfections at the Fe-N film surface) and “self-generated” disorder (intrinsic to the stripe formation process, in systems with competing interactions acting on different spatial scales) 6 – 8 , 31 , 32 .…”

Section: Introductioncontrasting

confidence: 71%

“…The film thickness is higher than the critical value, t c , which has to be exceeded for the formation of magnetic stripe domains. For Fe-N films, an approximate analytical estimate 14 provides nm, where 22 , 23 erg/cm is the exchange constant and erg/cm 3 is the perpendicular magnetic anisotropy constant. The saturation magnetization is emu/cm 3 , and the quality factor is .…”

Section: Resultsmentioning

confidence: 99%

“…In this work, we study the motion of topological defects that develop, in the form of magnetic edge dislocations, in the stripe domain structure of nitrogen-implanted iron (Fe-N) thin films with a moderate PMA 22 . By epitaxially growing Fe on a single crystal of ZnSe/GaAs(001), and using an opportune dose of ions for implantation 23 , it is possible to obtain straight and well-defined magnetic stripe domains with a few isolated edge dislocations. It is worth remarking that, in our Fe-N films, no experimental evidence was found for the inversion-symmetry-breaking Dzyaloshinskii-Moriya 24 , 25 interaction (DMI), which is known to be an important factor for the emergence and stabilization of topological defects in many spin systems 26 – 28 .…”

Section: Introductionmentioning

confidence: 99%

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Straight motion of half-integer topological defects in thin Fe-N magnetic films with stripe domains

Fin¹,

Silvani²,

Tacchi³

et al. 2018

Sci Rep

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In thin magnetic films with perpendicular magnetic anisotropy, a periodic “up-down” stripe-domain structure can be originated at remanence, on a mesoscopic scale (~100 nm) comparable with film thickness, by the competition between short-range exchange coupling and long-range dipolar interaction. However, translational order is perturbed because magnetic edge dislocations are spontaneously nucleated. Such topological defects play an important role in magnetic films since they promote the in-plane magnetization reversal of stripes and, in superconductor/ferromagnet hybrids, the creation of superconducting vortex clusters. Combining magnetic force microscopy experiments and micromagnetic simulations, we investigated the motion of two classes of magnetic edge dislocations, randomly distributed in an -implanted Fe film. They were found to move in opposite directions along straight trajectories parallel to the stripes axis, when driven by a moderate dc magnetic field. Using the approximate Thiele equation, analytical expressions for the forces acting on such magnetic defects and a microscopic explanation for the direction of their motion could be obtained. Straight trajectories are related to the presence of a periodic stripe domain pattern, which imposes the gyrotropic force to vanish even if a nonzero, half-integer topological charge is carried by the defects in some layers across the film thickness.

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Section: Introductioncontrasting

confidence: 71%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Straight motion of half-integer topological defects in thin Fe-N magnetic films with stripe domains

Fin¹,

Silvani²,

Tacchi³

et al. 2018

Sci Rep

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“…The value of K PMA has been quantitatively estimated by measuring the area between the magnetization curves with the field along the in-plane and out-of-plane directions. We obtained K PMA in the range from 5 to 7×10 6 erg cm −3 (see figure 7(c) later on), consistent with the reported values for the magnetocrystalline anisotropy of α′-Fe 8 N 1−x [85,86], and in agreement with K PMA values measured by ferromagnetic resonance [87]. We note that, assuming M s =1700 emu cm −3 [31], the quality factor Q of the Fe-N samples investigated in this work is between 0.275 and 0.385, depending on the preparation conditions, while the critical thickness above which the stripe domains appear is about 40 nm.…”

Section: Structural Investigationssupporting

confidence: 91%

Stripe domains reorientation in ferromagnetic films with perpendicular magnetic anisotropy

et al. 2020

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Ferromagnetic thin films with moderate perpendicular magnetic anisotropy (PMA) are known to support weak stripe domains provided film thickness exceeds a critical value. In this work, we performed both an experimental and theoretical investigation of a peculiar phenomenon shown by weak stripe domains: namely, the stripe domains reorientation when a dc magnetic field is applied in the film plane along the direction perpendicular to the stripes axis. We focus on bct α′-Fe 8 N 1−x thin films obtained by + N 2 implantation of α-Fe films epitaxially grown on ZnSe/GaAs(001). By using different ion implantation and heat treatment conditions, we show that it is possible to tune the PMA values. Magnetic force microscopy and vibrating sample magnetometer measurements prove the existence of weak stripe domains at remanence, and of a threshold field for the reorientation of the stripes axis in a transversal field. Using a one-dimensional model of the magnetic stripe domains, where the essential parameter is the maximum canting angle of the stripe magnetization out of the film plane, the various contributions to the magnetic energy can be separately calculated. A linear increase of the reorientation threshold field on the PMA is obtained, in qualitative agreement with experimental data in our Fe-N films, as well as in other thin films with weak stripe domains. Finally, we find that also the rotatable anisotropy field linearly increases as a function of the PMA magnitude.

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“…The presence of weak stripe domain structures has been also reported in FeGa 15,16,17 , FePd 13 , NiPd 18 , and Co/Fe multilayers 19 . Lately, a weak stripe domain structure was observed by some of us in nitrogen-implanted iron α'-FeN films 20,21 Here, stripe domains with a period of about 130 nm were found, at remanence, along the last saturating magnetic field direction.…”

Section: Introductionmentioning

confidence: 89%

Magnetization dynamics of weak stripe domains in Fe–N thin films: a multi-technique complementary approach

Camara¹,

Tacchi²,

Garnier³

et al. 2017

J. Phys.: Condens. Matter

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The resonant eigenmodes of a nitrogen-implanted iron α'-FeN characterized by weak stripe domains are investigated by Brillouin light scattering and broadband ferromagnetic resonance experiments, assisted by micromagnetic simulations. The spectrum of the dynamic eigenmodes in the presence of the weak stripes is very rich and two different families of modes can be selectively detected using different techniques or different experimental configurations. Attention is paid to the evolution of the mode frequencies and spatial profiles under the application of an external magnetic field, of variable intensity, in the direction parallel or transverse to the stripes. The different evolution of the modes with the external magnetic field is accompanied by a distinctive spatial localization in specific regions, such as the closure domains at the surface of the stripes and the bulk domains localized in the inner part of the stripes. The complementarity of BLS and FMR techniques, based on different selection rules, is found to be a fruitful tool for the study of the wealth of localized mag-netic excitations generally found in nanostructures.

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Influence of ion implantation parameters on the perpendicular magnetic anisotropy of Fe-N thin films with stripe domains

Abstract: International audienc

Cited by 11 publications

References 23 publications

Straight motion of half-integer topological defects in thin Fe-N magnetic films with stripe domains

Straight motion of half-integer topological defects in thin Fe-N magnetic films with stripe domains

Stripe domains reorientation in ferromagnetic films with perpendicular magnetic anisotropy

Magnetization dynamics of weak stripe domains in Fe–N thin films: a multi-technique complementary approach

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