High frequency spin torque oscillators with composite free layer spin valve
We report the oscillations of magnetic spin components in a composite free layer spin valve. The associated Landau–Lifshitz–Gilbert–Slonczewski (LLGS) equation is studied by stereographically projecting the spin on to a complex plane and the spin components were found. A fourth order Runge–Kutta num...
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Veröffentlicht in: | Journal of magnetism and magnetic materials 2016-07, Vol.410, p.210-217 |
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creator | Natarajan, Kanimozhi Arumugam, Brinda Rajamani, Amuda |
description | We report the oscillations of magnetic spin components in a composite free layer spin valve. The associated Landau–Lifshitz–Gilbert–Slonczewski (LLGS) equation is studied by stereographically projecting the spin on to a complex plane and the spin components were found. A fourth order Runge–Kutta numerical integration on LLGS equation also confirms the similar trajectories of the spin components. This study establishes the possibility of a Spin Torque Oscillator in a composite free layer spin valve, where the exchange coupling is ferromagnetic in nature. In-plane and out-of-plane precessional modes of magnetization oscillations were found in zero applied magnetic field and the frequencies of the oscillations were calculated from Fast Fourier Transform of the components of magnetization. Behavior of Power Spectral Density for a range of current density is studied. Finally our analysis shows the occurrence of highest frequency 150GHz, which is in the second harmonics for the specific choice of system parameters. |
doi_str_mv | 10.1016/j.jmmm.2016.03.032 |
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The associated Landau–Lifshitz–Gilbert–Slonczewski (LLGS) equation is studied by stereographically projecting the spin on to a complex plane and the spin components were found. A fourth order Runge–Kutta numerical integration on LLGS equation also confirms the similar trajectories of the spin components. This study establishes the possibility of a Spin Torque Oscillator in a composite free layer spin valve, where the exchange coupling is ferromagnetic in nature. In-plane and out-of-plane precessional modes of magnetization oscillations were found in zero applied magnetic field and the frequencies of the oscillations were calculated from Fast Fourier Transform of the components of magnetization. Behavior of Power Spectral Density for a range of current density is studied. Finally our analysis shows the occurrence of highest frequency 150GHz, which is in the second harmonics for the specific choice of system parameters.</description><identifier>ISSN: 0304-8853</identifier><identifier>DOI: 10.1016/j.jmmm.2016.03.032</identifier><language>eng</language><publisher>Elsevier B.V</publisher><subject>Current density ; Magnetization ; Mathematical analysis ; Oscillations ; Oscillators ; Power Spectral Density ; Runge-Kutta method ; Spin Torque Oscillator ; Spin Transfer Torque ; Spin valves ; Stereographic projection ; Torque</subject><ispartof>Journal of magnetism and magnetic materials, 2016-07, Vol.410, p.210-217</ispartof><rights>2016 Elsevier B.V.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c333t-51881081f1bf2a6ad1d23e49bd1415ab5ba4267bcf4469075d4690f1b8a47d663</citedby><cites>FETCH-LOGICAL-c333t-51881081f1bf2a6ad1d23e49bd1415ab5ba4267bcf4469075d4690f1b8a47d663</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.jmmm.2016.03.032$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>315,781,785,3551,27929,27930,46000</link.rule.ids></links><search><creatorcontrib>Natarajan, Kanimozhi</creatorcontrib><creatorcontrib>Arumugam, Brinda</creatorcontrib><creatorcontrib>Rajamani, Amuda</creatorcontrib><title>High frequency spin torque oscillators with composite free layer spin valve</title><title>Journal of magnetism and magnetic materials</title><description>We report the oscillations of magnetic spin components in a composite free layer spin valve. 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Finally our analysis shows the occurrence of highest frequency 150GHz, which is in the second harmonics for the specific choice of system parameters.</description><subject>Current density</subject><subject>Magnetization</subject><subject>Mathematical analysis</subject><subject>Oscillations</subject><subject>Oscillators</subject><subject>Power Spectral Density</subject><subject>Runge-Kutta method</subject><subject>Spin Torque Oscillator</subject><subject>Spin Transfer Torque</subject><subject>Spin valves</subject><subject>Stereographic projection</subject><subject>Torque</subject><issn>0304-8853</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNp9kE1LxDAQhnNQcP34A5569NKa782CF1nUFRe86DmkydRNaTc16a7svzelnoWBycD7hJkHoVuCK4KJvG-rtu_7iuZ3hVkueoYWmGFeKiXYBbpMqcUYE67kAr1t_NeuaCJ8H2BvT0Ua_L4YQ8xjEZL1XWfylIofP-4KG_ohJD_CBEDRmRPEmTia7gjX6LwxXYKbv36FPp-fPtabcvv-8rp-3JaWMTaWgihFsCINqRtqpHHEUQZ8VTvCiTC1qA2nclnbhnO5wkvhppbTyvClk5Jdobv53yGGvGcade-ThbzqHsIhaaKo4EIwvMpROkdtDClFaPQQfW_iSROsJ1u61ZMtPdnSmOWiGXqYIchHHD1EnUVkO-B8BDtqF_x_-C8gSHWy</recordid><startdate>20160715</startdate><enddate>20160715</enddate><creator>Natarajan, Kanimozhi</creator><creator>Arumugam, Brinda</creator><creator>Rajamani, Amuda</creator><general>Elsevier B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>20160715</creationdate><title>High frequency spin torque oscillators with composite free layer spin valve</title><author>Natarajan, Kanimozhi ; Arumugam, Brinda ; Rajamani, Amuda</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c333t-51881081f1bf2a6ad1d23e49bd1415ab5ba4267bcf4469075d4690f1b8a47d663</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>Current density</topic><topic>Magnetization</topic><topic>Mathematical analysis</topic><topic>Oscillations</topic><topic>Oscillators</topic><topic>Power Spectral Density</topic><topic>Runge-Kutta method</topic><topic>Spin Torque Oscillator</topic><topic>Spin Transfer Torque</topic><topic>Spin valves</topic><topic>Stereographic projection</topic><topic>Torque</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Natarajan, Kanimozhi</creatorcontrib><creatorcontrib>Arumugam, Brinda</creatorcontrib><creatorcontrib>Rajamani, Amuda</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of magnetism and magnetic materials</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Natarajan, Kanimozhi</au><au>Arumugam, Brinda</au><au>Rajamani, Amuda</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>High frequency spin torque oscillators with composite free layer spin valve</atitle><jtitle>Journal of magnetism and magnetic materials</jtitle><date>2016-07-15</date><risdate>2016</risdate><volume>410</volume><spage>210</spage><epage>217</epage><pages>210-217</pages><issn>0304-8853</issn><abstract>We report the oscillations of magnetic spin components in a composite free layer spin valve. The associated Landau–Lifshitz–Gilbert–Slonczewski (LLGS) equation is studied by stereographically projecting the spin on to a complex plane and the spin components were found. A fourth order Runge–Kutta numerical integration on LLGS equation also confirms the similar trajectories of the spin components. This study establishes the possibility of a Spin Torque Oscillator in a composite free layer spin valve, where the exchange coupling is ferromagnetic in nature. In-plane and out-of-plane precessional modes of magnetization oscillations were found in zero applied magnetic field and the frequencies of the oscillations were calculated from Fast Fourier Transform of the components of magnetization. Behavior of Power Spectral Density for a range of current density is studied. Finally our analysis shows the occurrence of highest frequency 150GHz, which is in the second harmonics for the specific choice of system parameters.</abstract><pub>Elsevier B.V</pub><doi>10.1016/j.jmmm.2016.03.032</doi><tpages>8</tpages></addata></record> |
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subjects | Current density Magnetization Mathematical analysis Oscillations Oscillators Power Spectral Density Runge-Kutta method Spin Torque Oscillator Spin Transfer Torque Spin valves Stereographic projection Torque |
title | High frequency spin torque oscillators with composite free layer spin valve |
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