Interactions and reversal-field memory in complex magnetic nanowire arrays

Rotaru, Aurelian; Lim, Jin-Hee; Lenormand, Denny; Diaconu, Andrei; Wiley, John B.; Postolache, Petronel; Stancu, Alexandru; Spînu, Leonard

doi:10.1103/physrevb.84.134431

Cited by 61 publications

(69 citation statements)

References 62 publications

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“…3). 30 Additionally, the magnetic interactions are found much stronger between NWs than between NTs. However, lowering the NW/NT diameter down to $35 nm, while keeping the interwire distance, should already lead to a similar behavior for both NW and NT arrays (Fig.…”

Section: A First Order Reversal Curvesmentioning

confidence: 99%

“…10 Various models have been recently developed for the interpretation of FORC results applied to arrays of nanowires. 11,28,30,32 These models then enable one to extract quantitative information on the coercivity distribution of individual nanowires, interaction field at saturation, and obtain insights into the magnetization reversal mechanism. For a better interpretation of the FORC measurements, it is usual to plot the FORC diagram as a contour plot of the FORC distribution (Fig.…”

Section: A First Order Reversal Curvesmentioning

confidence: 99%

“…The FORC method has proved to be an effective way to characterize magnetic interactions and magnetization reversal in nanomagnet arrays. [28][29][30][31]41 To obtain FORCs one first has to saturate the sample applying a large positive magnetic field. Then, we lower H to the so-called reversal field H r (not yet sufficient to saturate the sample in the negative direction), and measure the magnetization M as a function of H, varying H from H r to the positive saturation field value.…”

Section: A First Order Reversal Curvesmentioning

confidence: 99%

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Magnetic interactions and reversal mechanisms in Co nanowire and nanotube arrays

Proença¹,

Sousa

Escrig

et al. 2013

Journal of Applied Physics

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Ordered hexagonal arrays of Co nanowires (NWs) and nanotubes (NTs), with diameters between 40 and 65 nm, were prepared by potentiostatic electrodeposition into suitably modified nanoporous alumina templates. The geometrical parameters of the NW/NT arrays were tuned by the pore etching process and deposition conditions. The magnetic interactions between NWs/NTs with different diameters were studied using first-order reversal curves (FORCs). From a quantitative analysis of the FORC measurements, we are able to obtain the profiles of the magnetic interactions and the coercive field distributions. In both NW and NT arrays, the magnetic interactions were found to increase with the diameter of the NWs/NTs, exhibiting higher values for NW arrays. A comparative study of the magnetization reversal processes was also performed by analyzing the angular dependence of the coercivity and correlating the experimental data with theoretical calculations based on a simple analytical model. The magnetization in the NW arrays is found to reverse by the nucleation and propagation of a transverse-like domain wall; on the other hand, for the NT arrays a non-monotonic behavior occurs above a diameter of $50 nm, revealing a transition between the vortex and transverse reversal modes. V C 2013 American Institute of Physics. [http://dx

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Section: A First Order Reversal Curvesmentioning

confidence: 99%

Section: A First Order Reversal Curvesmentioning

confidence: 99%

Section: A First Order Reversal Curvesmentioning

confidence: 99%

See 1 more Smart Citation

Magnetic interactions and reversal mechanisms in Co nanowire and nanotube arrays

Proença¹,

Sousa

Escrig

et al. 2013

Journal of Applied Physics

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“…The FORC method is based on the procedure described by Mayergoyz 22 . It is a versatile yet a simple technique which provides plethora of quantitative information apart from the evaluations of the interaction in the hysteretic system regardless of whether it is bulk 23 , thin film [24][25][26][27][28][29] , nanowire [30][31][32] , magnetic tunnel junction 33,34 , ferroelectric switching 19,35 , patterned system 36,37 and permanent magnets 38 . In the present work, the irreversible switching processes during the magnetization reversal have been investigated for two systems namely viz.…”

Section: Introductionmentioning

confidence: 99%

Investigation on non-exchange spring behaviour and exchange spring behaviour: A first order reversal curve analysis

Roy¹,

Sreenivasulu²,

Kumar³

2013

Applied Physics Letters

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The magnetization behaviour of the soft Cobalt Ferrite-hard Strontium Ferrite nanocomposite is tuned from the non exchange spring nature to the exchange spring nature, by controlling the particle size of the soft Cobalt Ferrite in the Cobalt Ferrite: Strontium Ferrite (1:8) nanocomposite. The relative strength of the interaction governing the magnetization process in the nanocomposites is investigated using Henkel plot and First Order Reversal Curve (FORC) method. The FORC method has been utilized to understand the magnetization reversal behaviour as well as the extent of the irreversible magnetization present in both the nanocomposites having smaller and larger particle size of the Cobalt Ferrite. The magnetization process is primarily controlled by the domain wall movement in the nanocomposites. Using the FORC distribution in the (H a , H b ) co-ordinate, the onset of the nucleation field, invasion of the domain wall from the soft to the hard phase, domain wall annihilation and the presence of the reversible magnetization with the applied reversal field for both the nanocomposites has been investigated. It has been found that for the composite having lower particle size of the soft phase shows a single switching behaviour corresponding to the coherent reversal of the both soft and hard phases. However, the composite having higher Cobalt Ferrite particle size shows two peak behaviour in the FORC distribution resembling individual switching of the soft and hard phases. The FORC distribution in (H u , H c ) co-ordinate and the Henkel measurement confirms the dominant exchange interaction in the nanocomposites exhibiting exchange spring behaviour where as the occurrence of both the dipolar and exchange interaction is substantiated for the non exchange coupled nanocomposite. The asymmetric nature of the FORC distribution at H c = 0 Oe for both the nanocomposites validates the intercoupled nature of the reversible and irreversible magnetizations in both the nanocomposites. It is also concluded that the contribution of the reversible magnetization is more in the nanocomposite having lower particle size of the Cobalt Ferrite compared to the nanocomposite having higher particle size of the Cobalt Ferrite.

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“…The first-order reversal curve (FORC) technique has been widely used for the magnetization characterization in magnetic nanostructures [24][25][26][27][28]. It provides information about irreversible magnetic switching [29,30], magnetic interactions [31][32][33], distributions of magnetic characteristics [34,35], and magnetic phase separation [36,37], which are not easily accessible in conventional hysteresis loop investigations.…”

Section: Introductionmentioning

confidence: 99%

Magnetization reversal in kagome artificial spin ice studied by first-order reversal curves

et al. 2017

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Magnetization reversal of interconnected Kagome artificial spin ice was studied by the first-order reversal curve (FORC) technique based on the magneto-optical Kerr effect and magnetoresistance measurements. The magnetization reversal exhibits a distinct six-fold symmetry with the external field orientation. When the field is parallel to one of the nano-bar branches, the domain nucleation/propagation and annihilation processes sensitively depend on the field cycling history and the maximum field applied. When the field is nearly perpendicular to one of the branches, the FORC measurement reveals the magnetic interaction between the Dirac strings and orthogonal branches during the magnetization reversal process.Our results demonstrate that the FORC approach provides a comprehensive framework for understanding the magnetic interaction in the magnetization reversal processes of spinfrustrated systems.

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Interactions and reversal-field memory in complex magnetic nanowire arrays

Cited by 61 publications

References 62 publications

Magnetic interactions and reversal mechanisms in Co nanowire and nanotube arrays

Magnetic interactions and reversal mechanisms in Co nanowire and nanotube arrays

Investigation on non-exchange spring behaviour and exchange spring behaviour: A first order reversal curve analysis

Magnetization reversal in kagome artificial spin ice studied by first-order reversal curves

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