Magnetic properties of electrodeposited CoFeB thin films and nanowire arrays

Ciureanu, M.; Béron, Fanny; Clime, Liviu; Ciureanu, P.; Yelon, A.; Óvári, T.-A.; Cochrane, R. W.; Normandin, François; Veres, Teodor

doi:10.1016/j.electacta.2005.02.011

Cited by 60 publications

(35 citation statements)

References 25 publications

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“…This conclusion is consistent with reports in similar systems in which the magnetostatic coupling effects were inferred indirectly from the analysis of the hysteresis loops. 10,13,14 Moreover, in our study, we observe a more consistent dependence of the strength of the magnetostatic coupling on the diameter of the nanowires than in earlier reported data, presumably due to the lack of inhomogeneous magnetization states for this particular magnetic field configuration and history. 4 However, as seen in the experimental data, while the amplitude of the peaks in the modified Henkel plots increases as the nanowire diameter is increased, this change does not scale linearly with the magnetic moment associated with the nanowires, i.e., proportional to the volume of the nanowires, as expected in a simple dipole approximation.…”

Section: Resultscontrasting

confidence: 52%

Investigation of magnetic interactions in large arrays of magnetic nanowires

Fodor

Tsoi

Wenger

2008

Journal of Applied Physics

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The magnetic interactions in large arrays of ordered magnetic nanowires with 12-48 nm diameter and 55-95 nm spacing were investigated using modified Henkel plots. The measurements for nanowire arrays ac demagnetized with the field applied parallel to the nanowire axis ͑the easy magnetization axis͒ indicate that the dominant interaction during the switching process is the magnetostatic coupling between the nanowires. Nevertheless, while the strength of the magnetostatic interactions increases with the magnetic moment associated with the nanowires, the increase is not linear with respect to the volume of the nanowires. Moreover, the dependence of the remanence curves on the field history suggests that even for magnetic nanowire systems with high geometric anisotropy, the magnetic pole structure of the nanowires can be complex. This conclusion is also supported by the field dependence of the initial magnetization curves.

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Section: Resultscontrasting

confidence: 52%

Investigation of magnetic interactions in large arrays of magnetic nanowires

Fodor

Tsoi

Wenger

2008

Journal of Applied Physics

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“…The in-plane measurement for the 20 nm nanowire array indicates a positive ⌬H s ͑H s oop − H s ip ͒, indicating an in-plane easy axes arising due to very low induction in the sample. 5 The 100 and 200 nm nanowire arrays show almost similar loops for the out-ofplane and in-plane magnetizations, indicating an intermediate switching of the easy axis from out-of-plane to in-plane direction or vice versa. This can be attributed to magnetostatic interactions amongst the nanowires.…”

Section: Magnetic Hysteresis Loops "Mhls…mentioning

confidence: 88%

“…3 A lot of work has been carried out on binary samples such as 4 Fe-Ni, Co-Ni, and Co-Fe with phosphorus as the third element, and recently work on CoFe-B thin films and nanowire arrays was published to understand the role of the bulk characteristics and geometric factors on the array properties. 5 The purpose of our work is to study the structure and magnetic behavior of the amorphous Fe-Co-Ni-B alloy. The investigation of the magnetic behavior of this amorphous alloy was based on the limitations imposed by its size ͑nanometer͒ on the nanowire arrays.…”

Section: Introductionmentioning

confidence: 99%

X-ray diffraction analysis and magnetic behavior of amorphous Fe15Co17Ni58B10 nanowires obtained by electrochemical deposition

Vieyra

Meydan

Borza

2007

Journal of Applied Physics

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Fe 15 Co 17 Ni 58 B 10 nanowire arrays have been deposited in alumina templates by electrochemical deposition. For comparison, the same alloy was used to deposit films on CuBe substrate. The change in boron concentration from 3% to 10% in the electrolyte promoted the amorphous phase in the films on the CuBe substrate and a partial amorphous phase in the nanowires. Thermal treatment of the deposited films and nanowire arrays at 600°C promoted recrystallization. Magnetic hysteresis loops for 100 and 200 nm nanowire arrays are "wasp waisted." There is no evidence of a sharp reversal for the out-of-plane or in-plane hysteresis loops, just a smooth curve indicating a coherent rotation during the magnetization reversal. Annealing the 200 nm nanowire array at 600°C for 1 h gives rise to a mixed hysteresis loop, which can be attributed to competing domain configurations. An alternative explanation for this behavior is that there might be a phase separation between Fe, Ni, and Co in the nanowire environment due to the short range ordering of the alloy.

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“…The alignment of easy axis can also be specified by the sign of difference of saturation fields (∆H s ) here ∆H s = H s⁄⁄ -H s⊥ (Ciureanu et al, 2005). Here H s⁄⁄ is the saturation field when magnetic field is applied parallel to the nanocylinder axis and H s⊥ is the saturation field when the magnetic field is applied perpendicular to the nanocylinder axis.…”

Section: Magnetic and Magnetization Properties Of Nanowires And Nanotmentioning

confidence: 99%