Magnetization reversal in ultrathin ferromagnetic films with perpendicular anisotropy

Kirilyuk, Andrei; Ferré, J.; Grolier, V.; Jamet, J. P.; Renard, D.

doi:10.1016/s0304-8853(96)00744-5

Cited by 127 publications

(57 citation statements)

References 36 publications

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“…In the literature, mainly three ways of estimating the value of the critical field H c from V (H ) curves were used: (i) a linear extrapolation to zero velocity, V ∝ (H − H c ), from data around depinning, 1 (ii) when choosing a critical velocity V c , one can determine at low temperatures the critical field from V (H c ) = V c , 44,45 and (iii) the end of the creep regime from below as a lower bound for H c . 4 The first two protocols are useful when one has velocity-field curves over a limited field range.…”

Section: Experimental Estimates For H C and ψmentioning

confidence: 99%

Thermal rounding of the depinning transition in ultrathin Pt/Co/Pt films

2012

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We perform a scaling analysis of the mean velocity of extended magnetic domain walls driven in ultrathin Pt/Co/Pt ferromagnetic films with perpendicular anisotropy, as a function of the applied external field for different film thicknesses. We find that the scaling of the experimental data around the thermally rounded depinning transition is consistent with the universal depinning exponents theoretically expected for elastic interfaces described by the one-dimensional quenched Edwards-Wilkinson equation. In particular, values for the depinning exponent β and thermal rounding exponent ψ are tested, and the present analysis of the experimental data is compatible with β = 0.33 and ψ = 0.2, in agreement with numerical simulations.

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Section: Experimental Estimates For H C and ψmentioning

confidence: 99%

Thermal rounding of the depinning transition in ultrathin Pt/Co/Pt films

2012

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“…It should be noted that these are 0 K simulations so, as would be expected, the nucleation and propagation fields are much higher than in room temperature experiments. 17 However, there is a clear qualitative agreement between the simulation and experiment. Firstly, reducing the anisotropy leads to a reduction in the nucleation field until the magnetization lies in plane.…”

Section: Domain Wall Nucleation and Injectionmentioning

confidence: 65%

Controlling domain wall nucleation and injection through focussed ion beam irradiation in perpendicularly magnetized nanowires

et al. 2017

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Using Ga+ focussed ion beam irradiation of Ta/Pt/CoFeB/Pt perpendicularly magnetized nanowires, the nucleation and injection fields of domain walls into the nanowires is controlled. The nucleation and injection fields can be varied as a function of dose, however, the range of injection fields is found to be limited by the creation of a step in anisotropy between the irradiated and unirradiated regions. This can be altered by defocussing the beam, which allows the injection fields to be further reduced. The ability to define an arbitrary dose profile allows domain walls to be injected at different fields either side of an asymmetrically irradiated area, which could form the initial stage of a logic device. The effect of the thickness of the magnetic layer and the thickness of a Ta underlayer on the dose required to remove the perpendicular anisotropy is also studied and is seen that for similar Ta underlayers the dose is determined by the thickness of the magnetic layer rather than its anisotropy. This finding is supported by some transport of ions in matter simulations.

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“…, where t 0 , V A , and k B T are characteristic switching time when H¼H C , activation volume and thermal energy, respectively [26][27][28][29][30][31][32][33]. In the case of backward branch reversal, the DWs are frequently pinned during reversal process as mentioned before, implying that the reversal mechanism is DW creep motion [26,[30][31][32][33] at all t IrMn .…”

Section: Resultsmentioning

confidence: 99%