Magnetic interactions in compositionally modulated nanowire arrays

Palmero, Ester M.; Béron, Fanny; Bran, Cristina; Real, R. P. del; Vázquez, M.

doi:10.1088/0957-4484/27/43/435705

Cited by 29 publications

(26 citation statements)

References 40 publications

(52 reference statements)

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“…However, further increasing the Cu layer thickness (sample A5) decreases the number of domain wall nucleation sites and reduces the interaction between the magnetic layers, rising again the H c value. This behaviour has also been recently observed in FeCoCu/Cu multisegmented NWs with longer magnetic segments using first-order reversal curve measurements [30]. It is important to note that H c of sample A5 (δ Cu ∼ 80 nm) takes a higher value than H c of sample A1 (δ Cu = 0), concluding that the interactions between FeCoCu layers in sample A5 are very small.…”

Section: Magnetic Propertiessupporting

confidence: 78%

“…Therefore, using a template process in the electrochemical deposition is an excellent method to grow NWs and enables the tuning of the composition and the morphology of multisegmented structures [14] [15,16,17]. Segmented NWs with a magnetic/nonmagnetic mutilayered structure grown by pulsed electrodeposition have been highly investigated in the last years: Co/Cu [18,19,20], Ni/Cu [21,22,23] [24], Fe/Cu [25,26], CoFeB/Cu [27], CoFe/Cu [28,29,30], CoNi/Cu [31,14], CoPt/Pt [32], CoFe/Au [33], Ni/Au [34,35], etc.. Most of these works aim the application of spin valves and the exploration of the giant magnetoresistance effect [36] [37,38].…”

Section: Introductionmentioning

confidence: 99%

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Magnetic behaviour of multisegmented FeCoCu/Cu electrodeposited nanowires

Núñez

Pérez

Abuín

et al. 2017

J. Phys. D: Appl. Phys.

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Understanding the magnetic behaviour of multisegmented nanowires (NWs) is a major key for the application of such structures in future devices. In this work, magnetic/non-magnetic arrays of FeCoCu/Cu multilayered NWs electrodeposited in nanoporous alumina templates are studied. Contrarily to most reports on multilayered NWs, the magnetic layer thickness was kept constant (30 nm) and only the non-magnetic layer thickness was changed (0 to 80 nm). This allowed us to tune the interwire and intrawire interactions between the magnetic layers in the NW array creating a three-dimensional (3D) magnetic system without the need to change the template characteristics. Magnetic hysteresis loops, measured with the applied field parallel and perpendicular to the NWs' long axis, showed the effect of the non-magnetic Cu layer on the overall magnetic properties of the NW arrays. In particular, introducing Cu layers along the magnetic NW axis creates domain wall pinning nucleation that facilitate the magnetization reversal of the wires, as seen by the decrease in the parallel coercivity and the reduction of the perpendicular saturation field. By further increasing the Cu layer thickness, the interactions between the magnetic segments, both along the NW axis and of neighbouring NWs, decrease, thus rising again the parallel coercivity and the perpendicular saturation field. This work shows how one can easily tune the parallel and perpendicular magnetic properties of a 3D magnetic layer system by adjusting the non-magnetic layer thickness.

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Section: Magnetic Propertiessupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Magnetic behaviour of multisegmented FeCoCu/Cu electrodeposited nanowires

Núñez

Pérez

Abuín

et al. 2017

J. Phys. D: Appl. Phys.

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show abstract

“…In this sense, we can highlight some studies on multi-segmented NWs that employed Ni/Au [ 18 , 19 ], Ni/Cu [ 13 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ], CoNi/Cu [ 27 ], NiFe/Cu [ 28 ], FeGa/Cu [ 16 , 17 ], Co/Cu [ 29 , 30 , 31 , 32 ], and Co/Au [ 33 ]. Because of particular advantages, such as their high saturation magnetization [ 34 ] and the large possibility of modulation of their magnetic properties [ 35 ], systems with FeCo alloys (i.e., CoFeB/Cu [ 36 ], CoFe/Au [ 35 ], CoFe/Cu [ 37 , 38 , 39 , 40 , 41 ]) have been well studied. Núñez et al [ 37 ] investigated the magnetic behavior of CoFe/Cu multi-segmented NWs by varying the Cu spacer thickness.…”

Section: Introductionmentioning

confidence: 99%

“…Núñez et al [ 37 ] investigated the magnetic behavior of CoFe/Cu multi-segmented NWs by varying the Cu spacer thickness. Complementarily, Palmero et al [ 39 ] presented a study of first-order reversal curve (FORC) diagrams for CoFe/Cu multi-segmented NWs. However, for some applications, namely biomedical, Co is considered toxic, and, thus, a magnetic segment with only Fe in its composition could be more interesting.…”

Section: Introductionmentioning

confidence: 99%

The Role of Cu Length on the Magnetic Behaviour of Fe/Cu Multi-Segmented Nanowires

et al. 2018

Self Cite

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A set of multi-segmented Fe/Cu nanowires were synthesized by a two-step anodization process of aluminum substrates and a pulsed electrodeposition technique using a single bath. While both Fe segment length and diameter were kept constant to (30 ± 7) and (45 ± 5) nm, respectively, Cu length was varied between (15 ± 5) and (120 ± 10) nm. The influence of the non-magnetic layer thickness variation on the nanowire magnetic properties was investigated through first-order reversal curve (FORC) measurements and micromagnetic simulations. Our analysis confirmed that, in the multi-segmented Fe/Cu nanowires with shorter Cu segments, the dipolar coupling between Fe segments controls the nanowire magnetic behavior, and its performance is like that of a homogenous Fe nanowire array of similar dimensions. On the other hand, multi-segmented Fe/Cu nanowires with larger Cu segments act like a collection of non-interacting magnetic entities (along the nanowire axis), and their global behavior is mainly controlled by the neighbor-to-neighbor nanodisc dipolar interactions.

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“…Multisegmented magnetic nanowires produced by varying both, the chemical composition of each segment [26][27][28][29], or more recently by properly tuning the geometrical modulation in the diameter of each nanowire segment [30,31], have been proposed as novel 3D systems of magnetic multibit memories and logical devices. This peculiar assembling of building blocks made of consecutive segments with modulated composition and/or diameter for each nanowire, allows for the magnetization confinement in each nanowire segment, giving rise to arrays of nanowires with a magnetic multi-domain structure along the wire length, where the interface layer at the modulation can act as pinning center for magnetic domain wall displacement [32].…”

Section: Introductionmentioning

confidence: 99%

Effect of Sharp Diameter Geometrical Modulation on the Magnetization Reversal of bi-Segmented FeNi Nanowires

Méndez¹,

Vega²,

González³

et al. 2018

Preprint

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Controlling functional properties of matter and combine them for engineering a functional device is nowadays a common direction of scientific community. For instance, heterogeneous magnetic nanostructures can make use of different types of geometrical and compositional modulations to achieve the control of the magnetization reversal along with the nano-entities and thus enabling the fabrication of spintronic, magnetic data storage and sensing devices, among others. In this work, diameter modulated FeNi nanowires are fabricated paying special effort to obtain sharp transition regions between two segments of different diameters (from about 450 nm to 120 nm), enabling precise control over the magnetic behavior of the sample. Micromagnetic simulations performed on single bi-segmented nanowires predict a double step magnetization reversal where the wide segment magnetization switches near 200 Oe through a vortex domain wall, while at 500 Oe the magnetization of the narrow one is reversed through a corkscrew like mechanism. Finally, these results are confirmed with magneto-optic Kerr effect measurements at the transition of isolated bi-segmented nanowires. Furthermore, macroscopic vibrating sample magnetometry is used to demonstrate that the magnetic decoupling of nanowire segments is the main phenomenon occurring over the entire fabricated nanowires.

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Magnetic interactions in compositionally modulated nanowire arrays

Cited by 29 publications

References 40 publications

Magnetic behaviour of multisegmented FeCoCu/Cu electrodeposited nanowires

Magnetic behaviour of multisegmented FeCoCu/Cu electrodeposited nanowires

The Role of Cu Length on the Magnetic Behaviour of Fe/Cu Multi-Segmented Nanowires

Effect of Sharp Diameter Geometrical Modulation on the Magnetization Reversal of bi-Segmented FeNi Nanowires

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