High-frequency permeability of Ni and Co particle assemblies

A coaxial transmission line was constructed, characterized, and calibrated for the frequency dependent measurement of complex relative permeability (μr) and complex permittivity (εr). The permeability of Ni powder with a grain size of

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Veröffentlicht in:	Journal of applied physics 2014-05, Vol.115 (17)
Hauptverfasser:	Sakharov, V. K., Booth, R. A., Majetich, S. A.
Format:	Artikel
Sprache:	eng
Schlagworte:	Antiferromagnetism Cobalt Complex permittivity Current loss Eddy currents Magnetic permeability Nanoparticles Oxidation Packing density Permeability Transmission lines
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container_title	Journal of applied physics
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creator	Sakharov, V. K. Booth, R. A. Majetich, S. A.
description	A coaxial transmission line was constructed, characterized, and calibrated for the frequency dependent measurement of complex relative permeability (μr) and complex permittivity (εr). The permeability of Ni powder with a grain size of
doi_str_mv	10.1063/1.4866234
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K. ; Booth, R. A. ; Majetich, S. A.</creator><creatorcontrib>Sakharov, V. K. ; Booth, R. A. ; Majetich, S. A.</creatorcontrib><description>A coaxial transmission line was constructed, characterized, and calibrated for the frequency dependent measurement of complex relative permeability (μr) and complex permittivity (εr). The permeability of Ni powder with a grain size of < 1 μm was measured as a function of packing density to verify the system performance. 8–10 nm diameter Co nanoparticles were synthesized, dried to a powder, and measured. The real part of the permeability for the Co nanoparticles decreased over time as a result of oxidation, and decreased the overall magnetic volume due to the formation of an antiferromagnetic CoO shell. Similarly, the imaginary part of the permeability decreased as a function of oxidation. This was attributed to the insulating CoO shell reducing eddy current losses in the nanoparticle composite.</description><identifier>ISSN: 0021-8979</identifier><identifier>EISSN: 1089-7550</identifier><identifier>DOI: 10.1063/1.4866234</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Antiferromagnetism ; Cobalt ; Complex permittivity ; Current loss ; Eddy currents ; Magnetic permeability ; Nanoparticles ; Oxidation ; Packing density ; Permeability ; Transmission lines</subject><ispartof>Journal of applied physics, 2014-05, Vol.115 (17)</ispartof><rights>2014 AIP Publishing LLC.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c292t-152344eaec1ea8c1fbeb2a9c207f1b95585e0a05b6ba17a00d5070c57556495e3</citedby><cites>FETCH-LOGICAL-c292t-152344eaec1ea8c1fbeb2a9c207f1b95585e0a05b6ba17a00d5070c57556495e3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Sakharov, V. K.</creatorcontrib><creatorcontrib>Booth, R. A.</creatorcontrib><creatorcontrib>Majetich, S. A.</creatorcontrib><title>High-frequency permeability of Ni and Co particle assemblies</title><title>Journal of applied physics</title><description>A coaxial transmission line was constructed, characterized, and calibrated for the frequency dependent measurement of complex relative permeability (μr) and complex permittivity (εr). The permeability of Ni powder with a grain size of < 1 μm was measured as a function of packing density to verify the system performance. 8–10 nm diameter Co nanoparticles were synthesized, dried to a powder, and measured. The real part of the permeability for the Co nanoparticles decreased over time as a result of oxidation, and decreased the overall magnetic volume due to the formation of an antiferromagnetic CoO shell. Similarly, the imaginary part of the permeability decreased as a function of oxidation. This was attributed to the insulating CoO shell reducing eddy current losses in the nanoparticle composite.</description><subject>Antiferromagnetism</subject><subject>Cobalt</subject><subject>Complex permittivity</subject><subject>Current loss</subject><subject>Eddy currents</subject><subject>Magnetic permeability</subject><subject>Nanoparticles</subject><subject>Oxidation</subject><subject>Packing density</subject><subject>Permeability</subject><subject>Transmission lines</subject><issn>0021-8979</issn><issn>1089-7550</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><recordid>eNotkLFOwzAURS0EEqUw8AeRmBhS3rPj2JZYUAUUqYIFZst2X8BV0gQ7Hfr3BLXTXY7uPbqM3SIsEGrxgItK1zUX1RmbIWhTKinhnM0AOJbaKHPJrnLeAiBqYWbscRW_f8om0e-eduFQDJQ6cj62cTwUfVO8x8LtNsWyLwaXxhhaKlzO1Pk2Ur5mF41rM92ccs6-Xp4_l6ty_fH6tnxal4EbPpYoJ5-KHAUkpwM2njx3JnBQDXojpZYEDqSvvUPlADYSFAQ5qdeVkSTm7O7YO6R-8syj3fb7tJsmLUeulBCo5UTdH6mQ-pwTNXZIsXPpYBHs_zkW7ekc8QdkklTX</recordid><startdate>20140507</startdate><enddate>20140507</enddate><creator>Sakharov, V. 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The permeability of Ni powder with a grain size of < 1 μm was measured as a function of packing density to verify the system performance. 8–10 nm diameter Co nanoparticles were synthesized, dried to a powder, and measured. The real part of the permeability for the Co nanoparticles decreased over time as a result of oxidation, and decreased the overall magnetic volume due to the formation of an antiferromagnetic CoO shell. Similarly, the imaginary part of the permeability decreased as a function of oxidation. This was attributed to the insulating CoO shell reducing eddy current losses in the nanoparticle composite.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/1.4866234</doi><oa>free_for_read</oa></addata></record>
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subjects	Antiferromagnetism Cobalt Complex permittivity Current loss Eddy currents Magnetic permeability Nanoparticles Oxidation Packing density Permeability Transmission lines
title	High-frequency permeability of Ni and Co particle assemblies
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