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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.


Magnetic and structural characterizations.(a), Magnetization loop of a randomly oriented Co nanowire assembly at 300 K. (b), Magnetization loop of the aligned Co nanowire assembly (along parallel direction) at 300 K. (c), XRD pattern of the Co nanowires in random orientation. (d), XRD pattern of aligned Co nanowires in the alignment direction.
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f2: Magnetic and structural characterizations.(a), Magnetization loop of a randomly oriented Co nanowire assembly at 300 K. (b), Magnetization loop of the aligned Co nanowire assembly (along parallel direction) at 300 K. (c), XRD pattern of the Co nanowires in random orientation. (d), XRD pattern of aligned Co nanowires in the alignment direction.

Mentions: Figure 2a shows the magnetic hysteresis loop at room temperature of a randomly oriented Co nanowire assembly. X-ray diffraction of the assembly is shown beneath in Fig. 2c. Significant coercivity exceeding 6.5 kOe is observed, attributed to the magnetocrystalline anisotropy and the shape anisotropy. Although bulk Co material has an anisotropy field of 7.6 kOe, it is practically difficult to obtain a coercivity value of 6.5 kOe for any bulk cobalt materials. Shape anisotropy has played a substantial role in magnetic hardening of the nanowire assembly.


High energy product developed from cobalt nanowires.

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

Magnetic and structural characterizations.(a), Magnetization loop of a randomly oriented Co nanowire assembly at 300 K. (b), Magnetization loop of the aligned Co nanowire assembly (along parallel direction) at 300 K. (c), XRD pattern of the Co nanowires in random orientation. (d), XRD pattern of aligned Co nanowires in the alignment direction.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f2: Magnetic and structural characterizations.(a), Magnetization loop of a randomly oriented Co nanowire assembly at 300 K. (b), Magnetization loop of the aligned Co nanowire assembly (along parallel direction) at 300 K. (c), XRD pattern of the Co nanowires in random orientation. (d), XRD pattern of aligned Co nanowires in the alignment direction.
Mentions: Figure 2a shows the magnetic hysteresis loop at room temperature of a randomly oriented Co nanowire assembly. X-ray diffraction of the assembly is shown beneath in Fig. 2c. Significant coercivity exceeding 6.5 kOe is observed, attributed to the magnetocrystalline anisotropy and the shape anisotropy. Although bulk Co material has an anisotropy field of 7.6 kOe, it is practically difficult to obtain a coercivity value of 6.5 kOe for any bulk cobalt materials. Shape anisotropy has played a substantial role in magnetic hardening of the nanowire assembly.

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.