Anisotropic magnetoresistance (AMR) of cobalt: hcp-Co vs. fcc-Co

El-Tahawy, Moustafa; Péter, László; Kiss, L. F.; Gubicza, Jenő; Czigány, Zsolt; Molnár, György; Bakonyi, I.

doi:10.1016/j.jmmm.2022.169660

Cited by 14 publications

(29 citation statements)

References 76 publications

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“…The "hcp"-Co(Cu) and "hcp"-Co(Ni) layers with a nominal thickness of 5 μm and 3 μm, respectively, were deposited on a Si/ Cr(5 nm)/Cu(20 nm) substrate where both the Cr adhesion layer and the Cu substrate layer ensuring a conductive surface were prepared by evaporation on the Si wafer. The nominal thicknesses were obtained by using Faraday's law with 100% current efficiency which was justified by directly measuring deposit thickness with electron microscopy techniques 7 for pure hcp-Co deposits and the same current efficiency should remain valid also for the present "hcp"-Co (Cu) and "hcp"-Co(Ni) deposits as well.…”

Section: Methodsmentioning

confidence: 99%

“…Along this line, we have recently prepared electrodeposited Co metal foils from a simple CoSO 4 bath and studied their magnetic and magnetoresistance (MR) characteristics with special view on revealing a possible difference in the anisotropic magnetoresistance (AMR) of the two Co phases. 7 We have succeeded during that work in the preparation of (i) fully hcp-Co foils at high pH and low current density and (ii) Co foils with predominantly an fcc-Co phase and with a small fraction (about 25%) of an hcp-Co phase at low pH and high deposition current density. A specific outcome of this study was that the AMR ratio could be determined for the first time for the hcp-Co and fcc-Co phases separately.…”

mentioning

confidence: 93%

“…In the present work, we have investigated the phase formation and magnetoresistance characteristics of Co-Cu and Co-Ni alloy electrodeposits prepared under conditions which corresponded to the formation of a hcp phase for pure Co deposits in our previous work. 7 The incorporation of Cu and Ni into Co was achieved by adding varying amounts of CuSO 4 and NiSO 4 , respectively, to the CoSO 4 bath. These deposits will be denoted as "hcp"-Co(Cu) and "hcp"-Co(Ni) where the notation "hcp" refers to the deposition conditions of the hcp phase for pure Co deposits.…”

mentioning

confidence: 99%

“…Similar structural studies by various X-ray diffraction (XRD) geometries and MR measurements have been carried out as previously on the pure Co deposits. 7 The paper is organized as follows. In Experimental section, the preparation details of "hcp"-Co(Cu) and "hcp"-Co(Ni) electrodeposits, the structural characterization methods as well as the magnetoresistance measurement technique will be presented.…”

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confidence: 99%

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Metastable Phase Formation in Electrodeposited Co-Rich Co-Cu and Co-Ni Alloys

El-Tahawy

Péter

Gubicza

et al. 2023

J. Electrochem. Soc.

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Co-rich Co-Cu and Co-Ni alloy electrodeposits were prepared by adding varying amounts of CuSO4 and NiSO4, respectively, to a CoSO4 bath under conditions favoring the hcp phase formation. According to various X-ray diffraction studies, in both the Co Cu and Co Ni systems an hcp phase formed exclusively up to about 2 at.% of the alloying element. Above this concentration, a significant fcc phase fraction appeared in Co-Cu and a minor fcc fraction in Co-Ni up to about 8 at.%. The measured lattice constants are analyzed in comparison with Vegard’s law. For Co rich Co-Ni alloys, the concentration dependence of the lattice parameters was found to follow Vegard’s law for both the hcp and fcc phases. For the Co rich Co-Cu alloys, the data indicate a positive deviation from Vegard’s law for both the hcp and fcc phase which is due to the excess mixing volume required for solid solution alloy formation of these immiscible elements . The MR data are discussed in the light of the observed phases and of the MR parameters reported in our previous work on the hcp and fcc phases of pure Co.

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Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 93%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Metastable Phase Formation in Electrodeposited Co-Rich Co-Cu and Co-Ni Alloys

El-Tahawy

Péter

Gubicza

et al. 2023

J. Electrochem. Soc.

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“…While these two metals are cubic (bcc iron belongs to space group Im3false¯m, fcc nickel to Fm3false¯m), the situation is somewhat more complex for cobalt which exists in the hcp [91] (space group P6 3 /mmc) and fcc [92] phases. In polycrystalline samples [24], the AMR is a factor of about 1.8 larger for fcc than for hcp (hexagonal close packing). This behaviour was explained by differences in (calculated) DOS at the Fermi level.…”

Section: Methodsmentioning

confidence: 99%

Anisotropic magnetoresistance: materials, models and applications

Ritzinger,

Výborný

2023

R. Soc. open sci.

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Resistance of certain (conductive and otherwise isotropic) ferromagnets turns out to exhibit anisotropy with respect to the direction of magnetization: R ∥ for magnetization parallel to the electric current direction is different from R ⊥ for magnetization perpendicular to the electric current direction. In this review, this century-old phenomenon is reviewed both from the perspective of materials and physical mechanisms involved. More recently, this effect has also been identified and studied in antiferromagnets. To date, sensors based on the anisotropic magnetoresistance (AMR) effect are widely used in different fields, such as the automotive industry, aerospace or in biomedical imaging.

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