Dual band microwave ferromagnetic resonance absorption in annealed cobalt nanowire arrays
In this letter, we present a dual band microwave absorption phenomenon in 60 nm diameter Co ferromagnetic nanowire arrays annealed at 500 °C in nitrogen atmosphere. The frequency dependent microwave response of the wires is obtained for applied field parallel to the nanowire axis, below 4 kOe and ab...
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| Veröffentlicht in: | Applied physics letters 2014-11, Vol.105 (18) |
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| creator | Yuan, Lixin Meng, Siqin Shi, Yunzhou Zhang, Yao Yue, Zhenxing Li, Longtu |
| description | In this letter, we present a dual band microwave absorption phenomenon in 60 nm diameter Co ferromagnetic nanowire arrays annealed at 500 °C in nitrogen atmosphere. The frequency dependent microwave response of the wires is obtained for applied field parallel to the nanowire axis, below 4 kOe and above saturation magnetization up to 8 kOe, in steps of 1 kOe. For applied magnetic fields above saturation magnetization, two sets of absorption peaks are observed, while below saturation, only one single peak is obtained. Combining structural characterization and ferromagnetic resonance measurements, it is proven that the two ferromagnetic resonance peaks are associated with a coexistence of two kinds of nanopillars with different crystal structure in annealed nanowires, one for nanopillars with hexagonal close packed structure at higher ferromagnetic resonance frequency, and the other with face center cubic structure. |
| doi_str_mv | 10.1063/1.4901271 |
| format | Article |
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The frequency dependent microwave response of the wires is obtained for applied field parallel to the nanowire axis, below 4 kOe and above saturation magnetization up to 8 kOe, in steps of 1 kOe. For applied magnetic fields above saturation magnetization, two sets of absorption peaks are observed, while below saturation, only one single peak is obtained. Combining structural characterization and ferromagnetic resonance measurements, it is proven that the two ferromagnetic resonance peaks are associated with a coexistence of two kinds of nanopillars with different crystal structure in annealed nanowires, one for nanopillars with hexagonal close packed structure at higher ferromagnetic resonance frequency, and the other with face center cubic structure.</description><identifier>ISSN: 0003-6951</identifier><identifier>EISSN: 1077-3118</identifier><identifier>DOI: 10.1063/1.4901271</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Annealing ; Applied physics ; Crystal structure ; Ferromagnetic resonance ; Ferromagnetism ; Magnetic saturation ; Magnetism ; Magnetization ; Microwave absorption ; Nanowires ; Resonance absorption ; Structural analysis</subject><ispartof>Applied physics letters, 2014-11, Vol.105 (18)</ispartof><rights>2014 AIP Publishing LLC.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c257t-cd3891659c528f13049218bd26c00f3cfab09a4b9539517fb604db2c1b660f443</citedby><cites>FETCH-LOGICAL-c257t-cd3891659c528f13049218bd26c00f3cfab09a4b9539517fb604db2c1b660f443</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids></links><search><creatorcontrib>Yuan, Lixin</creatorcontrib><creatorcontrib>Meng, Siqin</creatorcontrib><creatorcontrib>Shi, Yunzhou</creatorcontrib><creatorcontrib>Zhang, Yao</creatorcontrib><creatorcontrib>Yue, Zhenxing</creatorcontrib><creatorcontrib>Li, Longtu</creatorcontrib><title>Dual band microwave ferromagnetic resonance absorption in annealed cobalt nanowire arrays</title><title>Applied physics letters</title><description>In this letter, we present a dual band microwave absorption phenomenon in 60 nm diameter Co ferromagnetic nanowire arrays annealed at 500 °C in nitrogen atmosphere. The frequency dependent microwave response of the wires is obtained for applied field parallel to the nanowire axis, below 4 kOe and above saturation magnetization up to 8 kOe, in steps of 1 kOe. For applied magnetic fields above saturation magnetization, two sets of absorption peaks are observed, while below saturation, only one single peak is obtained. 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The frequency dependent microwave response of the wires is obtained for applied field parallel to the nanowire axis, below 4 kOe and above saturation magnetization up to 8 kOe, in steps of 1 kOe. For applied magnetic fields above saturation magnetization, two sets of absorption peaks are observed, while below saturation, only one single peak is obtained. Combining structural characterization and ferromagnetic resonance measurements, it is proven that the two ferromagnetic resonance peaks are associated with a coexistence of two kinds of nanopillars with different crystal structure in annealed nanowires, one for nanopillars with hexagonal close packed structure at higher ferromagnetic resonance frequency, and the other with face center cubic structure.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/1.4901271</doi></addata></record> |
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| source | AIP Journals Complete; Alma/SFX Local Collection |
| subjects | Annealing Applied physics Crystal structure Ferromagnetic resonance Ferromagnetism Magnetic saturation Magnetism Magnetization Microwave absorption Nanowires Resonance absorption Structural analysis |
| title | Dual band microwave ferromagnetic resonance absorption in annealed cobalt nanowire arrays |
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