Magnetic properties and structure of cobalt-platinum thin films

Aboaf, J. A.; Herd, S. R.; Klokholm, E.

doi:10.1109/tmag.1983.1062575

Cited by 131 publications

(42 citation statements)

References 6 publications

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“…Zn can be electrodeposited and has an atomic radius similar to Pt (Callister 2003), so it is hypothesized that Zn may be a suitable candidate to replace Pt to form electrodeposited Co-rich Co-Zn magnetic films. It is expected to incorporate Zn atoms into Co lattice, up to about 20 at% Zn, as widely reported in Co-Pt magnetic films (Zana and Zangari 2003;Zana et al 2005;Aboaf et al 1983).…”

Section: Introductionmentioning

confidence: 59%

Morphology and magnetic properties of electroplated Co-rich Co-Zn thin films

2010

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This work explores the microstructure and magnetic properties of electrodeposited Co-Zn thin films. Using pulse-reverse electroplating technique, Co-rich Co-Zn films are deposited 0.4-1.9 lm thick from aqueous sulfate-based baths at low temperature (55°C). The influence of current density (25-100 mA/cm 2 ) and electrolyte Zn concentration (0-0.28 M) on the microstructure and magnetic properties are investigated. All of the Co-Zn films exhibit higher out-of-plane coercivity, as compared to in-plane. With increasing current density, the out-of-plane coercivity decreases from 50 to 40 kA/m (628-500 Oe). The influence of the Zn concentration in the electrolyte is more pronounced, affecting the grain size, film composition, and magnetic properties. The best magnetic properties were obtained from a bath with 0.21 M Zn and an average current density of 25 mA/cm 2 , resulting in a Co 97 Zn 3 composition and an out-of-plane coercivity of 92 kA/m (1,160 Oe).

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Section: Introductionmentioning

confidence: 59%

Morphology and magnetic properties of electroplated Co-rich Co-Zn thin films

2010

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“…As shown in Figure 3(c), two alloys with x ϭ 5 and 15 developed stacking faults (and twins) during crystallization. These structural defects serving as domainwall pinning sites could raise the coercivity, as observed in Co-Pt thin-film [13] and crystallized Fe 78 Si 9 B 13 . [14] In comparison, Co 39 Pt 39 B 10 Si 12 did not contain as much structural defect as seen in Figure 3(b), which could explain the relatively low coercivity of the material.…”

Section: Resultsmentioning

confidence: 94%

Crystallization of Co100-x Pt x B10Si12 amorphous metallic alloys

Yoo

Lim

Yoon

et al. 2004

Metall Mater Trans A

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“…It is known that Co-rich Co 80 Pt 20 P films exhibit large energy products in their as-deposited state due to the high anisotropy induced by the incorporation of Pt in the hexagonal close-packed ͑hcp͒ phase of Co. 10,11 Even though the Co-rich CoPtP has lower magnetic properties compared to the fct phase CoPt and FePt films, they do not require high temperature annealing, making them an attractive option for magnetic MEMS devices. Previous works 12,13 have demonstrated the use of electroplating technique for deposition of Co-rich CoPt films, having a single hcp phase.…”

Section: Development Of Nanostructured Stress-free Co-rich Coptp Filmentioning

confidence: 99%

Development of nanostructured, stress-free Co-rich CoPtP films for magnetic microelectromechanical system applications

Kulkarni¹,

Roy²

2007

Journal of Applied Physics

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Co-rich CoPtP alloys have been electrodeposited using direct current (dc) and pulse-reverse (PR) plating techniques. The surface morphology, crystalline structure, grain size, and magnetic properties of the plated films have been compared. The x-ray analysis and magnetic measurements reveal the presence of Co hcp hard magnetic phase with c axis perpendicular to the substrate for dc and in plane for PR plated films. The dc plated films have a granular structure in the micron scale with large cracks, which are manifestation of stress in the film. Only by using a combination of optimized PR plating conditions and stress relieving additive, we are able to produce 1–6μm thick (for 1 hour of plating), stress-free, and nanostructured (∼20nm) Co-rich CoPtP single hcp phase at room temperature, with an intrinsic coercivity of 1500Oe.

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Magnetic properties and structure of cobalt-platinum thin films

Cited by 131 publications

References 6 publications

Morphology and magnetic properties of electroplated Co-rich Co-Zn thin films

Morphology and magnetic properties of electroplated Co-rich Co-Zn thin films

Crystallization of Co100-x Pt x B10Si12 amorphous metallic alloys

Development of nanostructured, stress-free Co-rich CoPtP films for magnetic microelectromechanical system applications

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