First order reversal curve analysis of nanocrystalline Pd80Co20 alloy films

Cornejo, D.R.; Noce, Rodrigo Della; Peixoto, T. R. F.; Barelli, Nilso; Sumodjo, Paulo Teng An; Benedetti, Assis Vicente

doi:10.1016/j.jallcom.2008.12.131

Cited by 10 publications

(7 citation statements)

References 25 publications

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“…Although we measured the first-order reversal curves using low field sweep rates, dynamical effects are still observed. However, as Cornejo et al [34] experimentally confirmed, the use of different field sweep rates exclusively modifies the FORC features related to dynamical effects without affecting the rest of the FORC distributions (such as A, B, and C in our samples).…”

Section: -2supporting

confidence: 65%

“…In this work, we selected values for saturation field H sat of 5 kOe, H = 5 and 25 Oe, and H r = 5 and 10 Oe, based on the major hysteresis loops of 10-and 20-nm-thick film, respectively. In order to reduce the presence of dynamical or thermal activation effects [33,34], FORCs were measured using low field sweep rates such as 0.125 and 1.25 Oe/s, for 10-and 20-nm-thick CoCrPt films, respectively. For the same reason, we used a stabilization rate of 1 Oe/s for MOKE measurements in both samples.…”

Section: Methodsmentioning

confidence: 99%

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Microscopic reversal magnetization mechanisms in CoCrPt thin films with perpendicular magnetic anisotropy: Fractal structure versus labyrinth stripe domains

et al. 2017

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The magnetization reversal of CoCrPt thin films has been examined as a function of thickness using magnetooptical Kerr effect (MOKE) microscopy and first-order reversal curves (FORC) techniques. MOKE images show differentiated magnetization reversal regimes for different film thicknesses: while the magnetic domains in 10-nm-thick CoCrPt film resemble a fractal structure, a labyrinth stripe domain configuration is observed for 20-nm-thick films. Although FORC distributions for both cases show two main features related to irreversible processes (propagation and annihilation fields) separated by a mostly flat region, this method can nonetheless distinguish which magnetization reversal process is active according to the horizontal profile of the first FORC peak, or propagation field. A single-peak FORC profile corresponds to the fractal magnetization reversal, whereas a flat-peak FORC profile corresponds to the labyrinth magnetization reversal.

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Section: -2supporting

confidence: 65%

Section: Methodsmentioning

confidence: 99%

Microscopic reversal magnetization mechanisms in CoCrPt thin films with perpendicular magnetic anisotropy: Fractal structure versus labyrinth stripe domains

et al. 2017

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“…For each sample, a set of approximately 90 FORC's was measured using a field sweep rate of around 70 Oe/s, i.e. a value sufficiently low to reduce the presence of dynamic effects in the FORC diagrams [18]. Also, in order to avoid errors in the interpretations of the FORC diagrams a magnetic field step of 10 Oe (much smaller than the coercivity of the soft phase) was used.…”

Section: Methodsmentioning

confidence: 99%

First-order-reversal-curve analysis of Pr–Fe–B-based nanocomposites

Cornejo

Peixoto

Reboh

et al. 2010

Journal of Magnetism and Magnetic Materials

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a b s t r a c tRibbons of nominal composition (Pr 9.5 Fe 84.5 B 6 ) 0.96 Cr 0.01 (TiC) 0.03 were produced by arc-melting and melt-spinning the alloys on a Cu wheel. X-ray diffraction reveals two main phases, one based upon a-Fe and the other upon Pr 2 Fe 14 B. The ribbons show exchange spring behavior with H c =12.5 kOe and (BH) max =13.6 MGOe when these two phases are well coupled. Transmission electron microscopy revealed that the coupled behavior is observed when the microstructure consists predominantly of a-Fe grains (diameter $ 100 nm.) surrounded by hard material containing Pr 2 Fe 14 B. A first-order-reversalcurve (FORC) analysis was performed for both a well-coupled sample and a partially-coupled sample. The FORC diagrams show two strong peaks for both the partially-coupled sample and for the wellcoupled material. In both cases, the localization of the FORC probability suggests demagnetizing interactions between particles. Switching field distributions were calculated and are consistent with the sample microstructure.

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“…1) FORC analysis is now widely used in several laboratories because of its implementation simplicity [3,5]. Focusing on magnetic systems, FORC technique has been used to investigate diverse systems such as rock and mineral magnetism [3,6,7,8], magnetic media [9,10,11,12], GMR spin valves [13], magnetic tunnel junctions [14], thin films [15,16,17,18], magnetic multilayers with perpendicular magnetic anisotropy [19,20,21,22,23,24], magnetic dot/pillar assemblies [25,26,27], permanent magnets [28,29], exchange spring magnets [30], and nanowire assemblies [31,32,33,34,35,36,37,38,39,40,41,42], since isolated small diameter nanowires behave as basic hysterons. However, the understanding of the resulting FORC diagrams is not straightforward as it does not strictly represent the Preisach distribution.…”

Section: Introductionmentioning

confidence: 99%

FORC signatures and switching-field distributions of dipolar coupled nanowire-based hysterons

Pierrot

Béron

Blon

2020

Journal of Applied Physics

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Analysis of first-order reversal curves (FORCs) is a powerful tool to probe irreversible switching events in nanomagnet assemblies. As in essence switching events are related to the intrinsic properties of the constituents and their interactions, resulting FORC diagrams contain much information that can be crosslinked and complex to deconvoluate. In order to quantify the relevant parameters that drive the FORC diagrams of arrays of perpendicularly magnetized nanomagnets, we present step-by-step simulations of assemblies of hysterons to determine the specific signatures related to different known inputs. While we explored the consequences of dipolar interactions using either mean field or magnetostatic approaches, we completed by taking the hysteron switching-field distribution (SFD) as either normal or log-normal. We demonstrated that the transition between FORC diagrams composed of an isolated interaction field distribution (IFD) and a wishbone shape operates via the SFD deviation, 𝜎 𝐻 𝑠𝑤 , in the presence of a weakly dispersed interaction field. In the presence of a magnetostatic interaction field, the IFD profile is peaked and a coercive field distribution (CFD) sums to the IFD as 𝜎 𝐻 𝑠𝑤 increases. A transition between IFD+CFD and wishbone shapes is clearly demonstrated as a function of the interaction field deviation 𝜎 𝐻 𝑖𝑛𝑡 . In addition, we demonstrate that whatever the considered cases, 𝜎 𝐻 𝑠𝑤 can be quantitatively extracted from the FORC diagrams within an error inferior to 10%. These findings are of interest for dipolar coupled perpendicularly magnetized nanomagnets, as in assemblies of magnetic nanowires and nanopillars, as well as bit patterned media.

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First order reversal curve analysis of nanocrystalline Pd80Co20 alloy films

Cited by 10 publications

References 25 publications

Microscopic reversal magnetization mechanisms in CoCrPt thin films with perpendicular magnetic anisotropy: Fractal structure versus labyrinth stripe domains

Microscopic reversal magnetization mechanisms in CoCrPt thin films with perpendicular magnetic anisotropy: Fractal structure versus labyrinth stripe domains

First-order-reversal-curve analysis of Pr–Fe–B-based nanocomposites

FORC signatures and switching-field distributions of dipolar coupled nanowire-based hysterons

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