The influence of asymmetric electrodeposition voltage on the microstructure and magnetic properties of FexCo1−x nanowire arrays

Ramazani, A.; Kashi, M. Almasi; Kabiri, Shideh; Zanguri, M.

doi:10.1016/j.jcrysgro.2011.05.011

Cited by 8 publications

(10 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This reduction has been ascribed to a partial oxidation of the nanowires due to the own O 2 contained inside the AAO template. 15,16 Figs. 2(b) and 2(c) show the parallel and perpendicular hysteresis loops for the 18 nm diameter nanowire array in asdeposited and 500 C annealed states, respectively.…”

Section: A Experimental Resultsmentioning

confidence: 99%

Tuning the magnetization reversal process of FeCoCu nanowire arrays by thermal annealing

Bran

Ivanov

Garcı́a

et al. 2013

Journal of Applied Physics

View full text Add to dashboard Cite

Arrays of hexagonally ordered Fe 28 Co 67 Cu 5 nanowires with tailored diameter from 18 to 27 nm were prepared by electroplating into anodic alumina templates and annealed in the temperature range of 300-600 C, preserving but refining their bcc crystal structure. Despite the partial reduction of saturation magnetization and corresponding shape anisotropy after annealing at 500 C, larger coercivity, 0.36 T, and squareness ratio, M r /M s ¼ 0.98, were obtained. This unexpected behavior is interpreted through micromagnetic simulations where the magnetic hardening is associated with the transition from vortex to transverse domain-wall reversal modes connected with the reduction of saturation magnetization. Simulations also predict a significant coercivity increase with decreasing nanowires diameter which agrees with experimental data in the overlapping diameter range. V C 2013 AIP Publishing LLC. [http://dx

show abstract

Section: A Experimental Resultsmentioning

confidence: 99%

Tuning the magnetization reversal process of FeCoCu nanowire arrays by thermal annealing

Bran

Ivanov

Garcı́a

et al. 2013

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…Similar behavior, as a function of wires dimensions, was observed for other CoFe nanowire arrays. [15][16][17][18][19][20][21][22][23][24][25][26][27] …”

Section: Controlled Electrodeposition Of Comentioning

confidence: 99%

“…14 In the last decade, methods of electrodeposition, as well as the structural and magnetic properties of CoFe nanowire arrays have been extensively investigatied, [15][16][17][18][19][20][21][22][23][24][25][26][27] since CoFe materials have high * Electrochemical Society Member. z E-mail: tabakovicibro@gmail.com saturation magnetization, low coercivity and high magnetic shape anisotropy.…”

mentioning

confidence: 99%

Controlled Electrodeposition and Magnetic Properties of Co₃₅Fe₆₅Nanowires with High Saturation Magnetization

Ghemes

Dragos-Pinzaru

Chiriac

et al. 2016

J. Electrochem. Soc.

View full text Add to dashboard Cite

Among all transition metals magnetic alloys, Co 35 Fe 65 possesses the highest saturation magnetization B S = 2.45 T at room temperature given by the so-called "Slater-Pauling limit". For controlled electrodeposition of Co 35 Fe 65 nanowire arrays the following parameters were found to be optimal: electrolyte solution with 1-2 mM malonic acid (MA), ionic ratio Fe +2 /Co +2 = 2.0, growth rate, and pulsed potential deposition with time-on (2.5 s) at the potential of −1.15 V/SCE and time-off (1.0 s) at −0.70 V/SCE. These arrays were deposited inside anodic aluminum oxide (AAO) templates that contained columnar nanopores with diameters either 35 or 200 nm. Cyclic voltammetry was used in solution with and without MA and reaction mechanism was proposed to explain the critical role of MA in electrodeposition of CoFe alloys. In addition to uniform deposition of stechiometric Co 35 Fe 65 alloys, a selectivity ratio, (SR) ∼1.0, were achieved, which means that the atomic ratio of Fe/Co in the nanowire matched the molar ratio of Fe +2 /Co +2 in the electrolyte. The magnetic behavior of the subsequent 2.45 T Co 35 Fe 65 nanowire arrays showed that the shape and magnetostatic anisotropies dominated the effective anisotropy, and the impact of magnetocrystalline and magnetelastic anisotropies field was very small. 1 The highest saturation magnetization of all transition-metal (TM) alloys at room temperature shows Co 36 Fe 65 alloy with respective saturation magnetization of B s = 2.45 T, which is commonly referred to us as the "Slater-Pauling limit".2 Thin films of these alloys, obtained either by electrochemical deposition (ED) or called sputter deposition, are currently used in high areal recording density (HRD) heads including longitudinal (LMR), perpendicular (PMR), and heat assisted (HAMR) magnetic recording. In fact, about 15 years ago Seagate Technologies was first in the recording head industry to introduce 2.4 T CoFe as the longitudinal writer pole material-which was fabricated by electrodeposition. 3 The advantages of electrochemical vs. sputtering deposition include reduced process content, reduced variance and reduced cost. Importantly, controlled electrodeposition is possible even into high aspect ratio of templates including anodized aluminum oxide-AAO, diblock copolymers-DBC, carbonate membranes, and porous silicone. Porous AAO templates are particularly attractive since the pore diameters can be 10-300 nm with pore densities in the range of 10 9 to 10 11 cm −2 . 4 Ferromagnetic nanowire arrays have been used as a miniaturized devices in electronics and optics. 5 In addition, such nanowires have a promising biomagnetic applications like biosensing, cell separation, MRI contrast agents and magnetic hyperthermia. [6][7][8][9][10] Most biomagnetic studies have been limited to nanometer iron-oxide based nanoparticles for MRI imaging and magnetic hyperthermia.6 However, the low saturation magnetization of the bulk iron-oxides (e.g. B s ∼0.5 T for Fe 2 O 3 11 ) prevents them from becoming highly efficient in hypertherm...

show abstract

“…Fe-Co nanowires, however, show high coercivity and squareness, properties that make them good candidates as hard magnetic materials. A number of studies have reported the evolution and correlation of magnetic properties with the microstructure for arrays of nanowires with different composition and geometric characteristics (e.g., nanowire length and diameter; Fodor et al, 2002;Qin et al, 2002Qin et al, , 2003Ramazani et al, 2011Ramazani et al, , 2012. This section deals with the evolution of magnetic properties with the composition and diameter of Co x Fe 100-x nanowires and their correlation with the corresponding crystal symmetry.…”

Section: Fe-co Nanowiresmentioning

confidence: 99%

“…A number of studies have focused on the structural characterization of Fe-Co nanowires (Menon et al, 2001;Qin et al, 2002Qin et al, , 2003Ramazani et al, 2011Ramazani et al, , 2012. They show similar phase transitions with various alloy compositions but few differences in phase boundaries.…”

Section: Fe-co Nanowiresmentioning

confidence: 99%

Electrochemical synthesis of magnetic nanowires with controlled geometry and magnetic anisotropy

Prida¹,

Garcı́a²,

Hernando³

et al. 2015

Magnetic Nano- And Microwires

View full text Add to dashboard Cite

The influence of asymmetric electrodeposition voltage on the microstructure and magnetic properties of FexCo1−x nanowire arrays

Cited by 8 publications

References 25 publications

Tuning the magnetization reversal process of FeCoCu nanowire arrays by thermal annealing

Tuning the magnetization reversal process of FeCoCu nanowire arrays by thermal annealing

Controlled Electrodeposition and Magnetic Properties of Co₃₅Fe₆₅Nanowires with High Saturation Magnetization

Electrochemical synthesis of magnetic nanowires with controlled geometry and magnetic anisotropy

Contact Info

Product

Resources

About

The influence of asymmetric electrodeposition voltage on the microstructure and magnetic properties of FexCo1−x nanowire arrays

Cited by 8 publications

References 25 publications

Tuning the magnetization reversal process of FeCoCu nanowire arrays by thermal annealing

Tuning the magnetization reversal process of FeCoCu nanowire arrays by thermal annealing

Controlled Electrodeposition and Magnetic Properties of Co35Fe65Nanowires with High Saturation Magnetization

Electrochemical synthesis of magnetic nanowires with controlled geometry and magnetic anisotropy

Contact Info

Product

Resources

About

Controlled Electrodeposition and Magnetic Properties of Co₃₅Fe₆₅Nanowires with High Saturation Magnetization