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High energy product developed from cobalt nanowires.

Gandha K, Elkins K, Poudyal N, Liu X, Liu JP - Sci Rep (2014)

Bottom Line: Based on the shape anisotropy and orientation of the nanowire assemblies, a record high room-temperature coercivity of 10.6 kOe has been measured in Co nanowires with a diameter of about 15 nm and a mean length of 200 nm.As a result, energy product of the wires reaches 44 MGOe.It is discovered that the morphology uniformity of the nanowires is the key to achieving the high coercivity and high energy density.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, University of Texas at Arlington, Arlington, TX 76019, USA.

ABSTRACT
Cobalt nanowires with high aspect ratio have been synthesized via a solvothermal chemical process. Based on the shape anisotropy and orientation of the nanowire assemblies, a record high room-temperature coercivity of 10.6 kOe has been measured in Co nanowires with a diameter of about 15 nm and a mean length of 200 nm. As a result, energy product of the wires reaches 44 MGOe. It is discovered that the morphology uniformity of the nanowires is the key to achieving the high coercivity and high energy density. Nanowires of this type are ideal building blocks for future bonded, consolidated and thin film magnets with high energy density and high thermal stability.

No MeSH data available.


Related in: MedlinePlus

TEM analysis of Cobalt nanowires.(a), Bright-field TEM image of the Co nanowires. (b), Bright-field TEM image of an end-tip single Co nanowire. (c), High resolution TEM image of a single Co nanowire in [11–20] zone axis. Inset the corresponding numerical FFT pattern. (d), Hologram of a single Co nanowire (with the same magnification as (b)).
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f1: TEM analysis of Cobalt nanowires.(a), Bright-field TEM image of the Co nanowires. (b), Bright-field TEM image of an end-tip single Co nanowire. (c), High resolution TEM image of a single Co nanowire in [11–20] zone axis. Inset the corresponding numerical FFT pattern. (d), Hologram of a single Co nanowire (with the same magnification as (b)).

Mentions: Figure 1 shows the morphology of the Co nanowires synthesized via a solvothermal chemical process. X-ray diffraction shows that the wires have an expected hcp crystal structure. As shown in Fig. 1a and 1b, the Co nanowires have cylinder shapes with ellipsoidal tips. The wires have typical size about 200 to 300 nm in length and an average diameter of 15 nm from the TEM observation. The high resolution TEM results (Fig. 1c) indicate that each wire is a single crystal with the c-axis (002), or the easy magnetization direction, along the long axis of the wire. The magnetic holography image (Fig. 1d) reveals a single-domain structure and confirms the magnetization orientation along the long axis. This magnetocrystalline configuration, coupled with the shape of high aspect ratio, favors a coherent rotation of the magnetization process and thus should lead to large coercivity of the nanowire assemblies.


High energy product developed from cobalt nanowires.

Gandha K, Elkins K, Poudyal N, Liu X, Liu JP - Sci Rep (2014)

TEM analysis of Cobalt nanowires.(a), Bright-field TEM image of the Co nanowires. (b), Bright-field TEM image of an end-tip single Co nanowire. (c), High resolution TEM image of a single Co nanowire in [11–20] zone axis. Inset the corresponding numerical FFT pattern. (d), Hologram of a single Co nanowire (with the same magnification as (b)).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4061547&req=5

f1: TEM analysis of Cobalt nanowires.(a), Bright-field TEM image of the Co nanowires. (b), Bright-field TEM image of an end-tip single Co nanowire. (c), High resolution TEM image of a single Co nanowire in [11–20] zone axis. Inset the corresponding numerical FFT pattern. (d), Hologram of a single Co nanowire (with the same magnification as (b)).
Mentions: Figure 1 shows the morphology of the Co nanowires synthesized via a solvothermal chemical process. X-ray diffraction shows that the wires have an expected hcp crystal structure. As shown in Fig. 1a and 1b, the Co nanowires have cylinder shapes with ellipsoidal tips. The wires have typical size about 200 to 300 nm in length and an average diameter of 15 nm from the TEM observation. The high resolution TEM results (Fig. 1c) indicate that each wire is a single crystal with the c-axis (002), or the easy magnetization direction, along the long axis of the wire. The magnetic holography image (Fig. 1d) reveals a single-domain structure and confirms the magnetization orientation along the long axis. This magnetocrystalline configuration, coupled with the shape of high aspect ratio, favors a coherent rotation of the magnetization process and thus should lead to large coercivity of the nanowire assemblies.

Bottom Line: Based on the shape anisotropy and orientation of the nanowire assemblies, a record high room-temperature coercivity of 10.6 kOe has been measured in Co nanowires with a diameter of about 15 nm and a mean length of 200 nm.As a result, energy product of the wires reaches 44 MGOe.It is discovered that the morphology uniformity of the nanowires is the key to achieving the high coercivity and high energy density.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, University of Texas at Arlington, Arlington, TX 76019, USA.

ABSTRACT
Cobalt nanowires with high aspect ratio have been synthesized via a solvothermal chemical process. Based on the shape anisotropy and orientation of the nanowire assemblies, a record high room-temperature coercivity of 10.6 kOe has been measured in Co nanowires with a diameter of about 15 nm and a mean length of 200 nm. As a result, energy product of the wires reaches 44 MGOe. It is discovered that the morphology uniformity of the nanowires is the key to achieving the high coercivity and high energy density. Nanowires of this type are ideal building blocks for future bonded, consolidated and thin film magnets with high energy density and high thermal stability.

No MeSH data available.


Related in: MedlinePlus