Deterioration of the coercivity due to the diffusion induced interface layer in hard/soft multilayers

Wen-Jing, Si; Zhao, Guoping; Ran, Nian; Yi, Peng; Morvan, F. J.; Wan, X. L.

doi:10.1038/srep16212

Cited by 45 publications

(14 citation statements)

References 34 publications

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“…This means that, by increasing the reverse field, the soft phase domain walls move toward the interface between the soft and hard phases and exceed into the hard phase and cause magnetization reverse to that phase. Therefore, the coercivity of the samples decreases in comparison to the hard phase region [40,41]. Considering the small size and proximity of hard-soft phases (Figure 2), it is possible that the volume fraction of the hard phase is enough to exert exchange force on magnetization in a soft grain of SFO, thus preventing the magnetization in soft grains from reversal with the applied field reversal.…”

Section: Resultsmentioning

confidence: 99%

Exchange-Coupling Behavior in SrFe12O19/La0.7Sr0.3MnO3 Nanocomposites

2019

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Magnetically hard-soft (100-x) SrFe12O19–x wt % La0.7Sr0.3MnO3 nanocomposites were synthesized via a one-pot auto-combustion technique using nitrate salts followed by heat treatment in air at 950 °C. X-ray diffraction (XRD), transmission electron microscopy (TEM), and vibrating sample magnetometry (VSM) were used to characterize the structural and magnetic properties of the samples. XRD spectra revealed the formation of a mixture of ferrite and magnetite phases without any trace of secondary phases in the composite. Microstructural images show the proximity grain growth of both phases. The room temperature hysteresis loops of the samples showed the presence of exchange-coupling between the hard and soft phases of the composite. Although saturation magnetization reduced by 41%, the squareness ratio and coercivity of the nanocomposite improved significantly up to 6.6% and 81.7%, respectively, at x = 40 wt % soft phase content in the nanocomposite. The enhancement in squareness ratio and coercivity could be attributed to the effective exchange-coupling interaction, while the reduction in saturation magnetization could be explained on the basis of atomic intermixing between phases in the system. Overall, these composite particles exhibited magnetically single-phase behavior. The adopted synthesis method is low cost and rapid and results in pure crystalline nanocomposite powder. This simple method is a promising way to tailor and enhance the magnetic properties of oxide-based hard-soft magnetic nanocomposites.

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Section: Resultsmentioning

confidence: 99%

Exchange-Coupling Behavior in SrFe12O19/La0.7Sr0.3MnO3 Nanocomposites

2019

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“…To produce and stabilize skyrmions, the film should be ultrathin and the interface should be flat enough. There should be very limited atomic diffusion and defects in the system 29,30 , so that the DMI level can be kept to stabilize the skyrmions. In comparison, many bulk magnetic materials with acentric structures, such as MnSi 2 , FeGe 31 , Cu 2 OSeO 3 8 , and GaV 4 S 8 32 , have been found having DMI.…”

Section: Introductionmentioning

confidence: 99%

An achiral ferromagnetic/chiral antiferromagnetic bilayer system leading to controllable size and density of skyrmions

Morvan

Luo

Yang

et al. 2019

Sci Rep

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Magnetic skyrmions are topologically protected domain structures related to the Dzyaloshinskii-Moriya interaction (DMI). To understand how magnetic skyrmions occur under different circumstances, we propose a model for skyrmion formation in a bilayer system of ferromagnetic/antiferromagnetic (FM/AFM) films, in which the bulk DMI is only present in the AFM film. Micromagnetic simulations reveal that skyrmions are formed in this system due to the competition between the DMI and demagnetization energies. A critical interfacial exchange energy ( A i = 6.5 mJ/m 2 ) is determined, above which the competition occurs at its full extent. More skyrmions are formed with increasing external magnetic field till a critical value above which the external field is too large and thus leading to the annihilation of skyrmions. The spacing between two skyrmions can be as small as 45 nm. Our results may give technological implications for future skyrmion applications.

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“…The above formula is consistent with that derived by Zhao et al . 30 , 31 and Pellicelli et al . 26 for the nucleation field at the case K int = 0.…”

Section: Resultsmentioning

confidence: 96%

“…( 10 ) for various values of layer thickness. The parameters for the calculation are shown in Table 1 31 . Nd 2 Fe 14 B is selected as the hard phase because it is the best permanent magnet so far with the largest reported energy product due to its high values for both the crystalline anisotropy and the spontaneous magnetization.…”

Section: Resultsmentioning

confidence: 99%

The effect of interface anisotropy on demagnetization progress in perpendicularly oriented hard/soft exchange-coupled multilayers

Zhao¹,

Wang²,

Zhang³

et al. 2017

Sci Rep

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The demagnetization progress of various hard/soft multilayers with perpendicular crystalline anisotropy has been studied by a micromagnetic model, incorporating the effect of the interface anisotropy, which is evident on the nucleation field when the soft layer thickness is small. Both microscopic and macroscopic hysteresis loops as well as angular distributions for the magnetizations in the thickness direction have been calculated, taking into account of realistic values of the interface anisotropy. The formula for the nucleation field has been derived analytically, where the nucleation field increases linearly with the interface anisotropy for a wide thickness region. While the nucleation field could change by more than 90% due to the influence of the interface anisotropy, the interface anisotropy has no effect on the pinning field or the coercivity, but it has some slight influence on the angular distributions. On the other hand, positive interface anisotropy enhances the remanence and the energy products, whereas negative interface anisotropy deteriorates both of them. Comparison with the experimental data justifies our calculation, indicating that negative interface anisotropy should be avoided in the experiment.

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Deterioration of the coercivity due to the diffusion induced interface layer in hard/soft multilayers

Cited by 45 publications

References 34 publications

Exchange-Coupling Behavior in SrFe12O19/La0.7Sr0.3MnO3 Nanocomposites

Exchange-Coupling Behavior in SrFe12O19/La0.7Sr0.3MnO3 Nanocomposites

An achiral ferromagnetic/chiral antiferromagnetic bilayer system leading to controllable size and density of skyrmions

The effect of interface anisotropy on demagnetization progress in perpendicularly oriented hard/soft exchange-coupled multilayers

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