Magnetic study of Cu1−xMnxO (0 ≤ x ≤ 0.08) nanoparticles

Hussain, Shahzad; Mumtaz, A.; Hasanain, S. K.; Usman, M.

doi:doi:10.1063/1.3677975

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The origin of unique initial magnetization curves in Dy-substituted (Nd₁₋_x, Dy_x)₂Fe₁₄B (x = 0−1) sintered magnets

The coercivities (Hc), saturation magnetizations (Js), and anisotropy constants K1 of (Nd1−x, Dyx)2Fe14B sintered magnets (x = 0 to 1.0) are determined using high magnetic field measurements up to about 8 MA/m. The Ha, Js, and K1 values of samples with x < 0.5 are similar to those obtained in previous studies using single crystals; the Hc values for the sintered magnets are reported here for the first time. The magnetization into the single-domain states (SDS) in Dy-substituted sintered mag...

Optically driven method for magnetically levitating diamagnetic material using photothermal effect

Optically driven actuators do not require contact and thus can be used to generate movement remotely. In this paper, we propose a method for optically driving a magnetic levitation system that consists of a diamagnetic material as the moving object, a neodymium magnet, and a temperature-sensitive ferrite for varying the potential energy of the diamagnetic object. The diamagnetic object is levitated by the magnetic force between it and the neodymium magnet. Laser irradiation of the temperature-s...

Cu_1−xMn_xO (0 ≤ x ≤ 0.08) nanoparticles were synthesized by a coprecipitation method. Powder x ray analysis reveals that samples show a pure CuO phase for x ≤ 0.06 and the appearance of a secondary phase CuMn₂O₄ for x > 0.06. The unit cell volume expands with increasing Mn concentration up to x = 0.06 and remains constant on further increase in Mn concentration. The undoped sample shows the behavior of pure CuO with antiferromagnetic transitions at T_N1 = 228 K and T_N2 = 214 K. Inclusion of Mn into the Cu sublattice turned antiferromagnetic CuO into a ferromagnet. The origin of ferromagnetism is analyzed on the basis of different possible interactions. It is believed that the indirect coupling between Mn ions mediated by O and Cu ions helps to stabilize the ferromagnetism.

Article Outline

INTRODUCTION
SYNTHESIS AND CHARACTERIZATION
RESULTS AND DISCUSSION
SUMMARY

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KEYWORDS, PACS, and IPC

Keywords

antiferromagnetic materials, copper compounds, doping profiles, ferromagnetic materials, magnetic particles, magnetic transitions, manganese, nanofabrication, nanomagnetics, nanoparticles, precipitation (physical chemistry), semiconductor doping, semiconductor growth, semimagnetic semiconductors, X-ray chemical analysis

PACS

75.50.Tt

Fine-particle systems; nanocrystalline materials
82.80.Ej

X-ray, Mössbauer, and other γ-ray spectroscopic analysis methods
75.30.Kz

Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.50.Dd

Nonmetallic ferromagnetic materials
75.50.Ee

Antiferromagnetics
75.50.Pp

Magnetic semiconductors

International Patent Classification (IPC)

B82B1/00
Nano-structures
B82B3/00
Manufacture or treatment of nano-structures
H01F1/00
Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
H01F1/40
Of magnetic semiconductor materials, e.g. cdcr2s4
H01L21/02
Manufacture or treatment of semiconductor devices or of parts thereof
H01L21/70
Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in or on a common substrate or of specific parts thereof; Manufacture of integrated circuit devices or of specific parts thereof

ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1063/1.3677975

PUBLICATION DATA

ISSN

0021-8979 (print)

1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef

American Institute of Physics

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