A Micromagnetic Study of the Effect of Spatial Variations in Damping in Perpendicular Recording Heads
We have used micromagnetic modeling to study the effect of the gyromagnetic damping constant, alpha, on the dynamics of a perpendicular write head. Cases are considered where different regions of the head have different values of alpha, to examine where increased damping might offer benefits in head...
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| Veröffentlicht in: | IEEE transactions on magnetics 2006-10, Vol.42 (10), p.2428-2430 |
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| creator | Kaya, A. Benakli, M. Mallary, M.L. Bain, J.A. |
| description | We have used micromagnetic modeling to study the effect of the gyromagnetic damping constant, alpha, on the dynamics of a perpendicular write head. Cases are considered where different regions of the head have different values of alpha, to examine where increased damping might offer benefits in head field rise time. It is found that increasing alpha in the pole region from 0.02 to 0.2 significantly improves both field rise time and amplitude at a drive frequency of 1 Gb/s. Similar increases in the damping of the yoke region and in the soft underlayer (SUL) did not yield nearly as significant improvements in field magnitudes or rise times, but was associated with reduced noise from the SUL. It is also noted for a monopole head design, that a SUL with higher magnetization-thickness product, M S t, is needed to achieve the desired field amplitude as compared to a shielded pole head. An improvement in the gradient of the field is observed for the shielded head design along with a reduction in the field magnitude |
| doi_str_mv | 10.1109/TMAG.2006.879430 |
| format | Article |
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Cases are considered where different regions of the head have different values of alpha, to examine where increased damping might offer benefits in head field rise time. It is found that increasing alpha in the pole region from 0.02 to 0.2 significantly improves both field rise time and amplitude at a drive frequency of 1 Gb/s. Similar increases in the damping of the yoke region and in the soft underlayer (SUL) did not yield nearly as significant improvements in field magnitudes or rise times, but was associated with reduced noise from the SUL. It is also noted for a monopole head design, that a SUL with higher magnetization-thickness product, M S t, is needed to achieve the desired field amplitude as compared to a shielded pole head. An improvement in the gradient of the field is observed for the shielded head design along with a reduction in the field magnitude</description><identifier>ISSN: 0018-9464</identifier><identifier>EISSN: 1941-0069</identifier><identifier>DOI: 10.1109/TMAG.2006.879430</identifier><identifier>CODEN: IEMGAQ</identifier><language>eng</language><publisher>New York, NY: IEEE</publisher><subject>Amplitudes ; Anisotropic magnetoresistance ; Coils ; Cross-disciplinary physics: materials science; rheology ; Damping ; Dynamic tests ; Dynamics ; Exact sciences and technology ; high-frequency recording ; Magnetic anisotropy ; Magnetic heads ; Magnetism ; Magnetostatic waves ; Materials science ; micromagnetic ; Micromagnetics ; Noise ; Other topics in materials science ; perpendicular head ; Perpendicular magnetic anisotropy ; Perpendicular magnetic recording ; Physics ; Poles ; Recording heads ; Saturation magnetization ; Yokes</subject><ispartof>IEEE transactions on magnetics, 2006-10, Vol.42 (10), p.2428-2430</ispartof><rights>2007 INIST-CNRS</rights><rights>Copyright The Institute of Electrical and Electronics Engineers, Inc. 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Cases are considered where different regions of the head have different values of alpha, to examine where increased damping might offer benefits in head field rise time. It is found that increasing alpha in the pole region from 0.02 to 0.2 significantly improves both field rise time and amplitude at a drive frequency of 1 Gb/s. Similar increases in the damping of the yoke region and in the soft underlayer (SUL) did not yield nearly as significant improvements in field magnitudes or rise times, but was associated with reduced noise from the SUL. It is also noted for a monopole head design, that a SUL with higher magnetization-thickness product, M S t, is needed to achieve the desired field amplitude as compared to a shielded pole head. An improvement in the gradient of the field is observed for the shielded head design along with a reduction in the field magnitude</description><subject>Amplitudes</subject><subject>Anisotropic magnetoresistance</subject><subject>Coils</subject><subject>Cross-disciplinary physics: materials science; rheology</subject><subject>Damping</subject><subject>Dynamic tests</subject><subject>Dynamics</subject><subject>Exact sciences and technology</subject><subject>high-frequency recording</subject><subject>Magnetic anisotropy</subject><subject>Magnetic heads</subject><subject>Magnetism</subject><subject>Magnetostatic waves</subject><subject>Materials science</subject><subject>micromagnetic</subject><subject>Micromagnetics</subject><subject>Noise</subject><subject>Other topics in materials science</subject><subject>perpendicular head</subject><subject>Perpendicular magnetic anisotropy</subject><subject>Perpendicular magnetic recording</subject><subject>Physics</subject><subject>Poles</subject><subject>Recording heads</subject><subject>Saturation magnetization</subject><subject>Yokes</subject><issn>0018-9464</issn><issn>1941-0069</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2006</creationdate><recordtype>article</recordtype><sourceid>RIE</sourceid><recordid>eNpdkM1rGzEQxUVJoY7be6EXESjkYldfu5aOJnGdQkJC83EVE2mUyKx3t9LuIf99tbUh0NO8mfm9YXiEfOVsyTkzPx5u1tulYKxe6pVRkn0gM24UX5SJOSEzxrheGFWrT-Q0511pVcXZjOCa3kSXuj28tDhER--H0b_RLtDhFekmBHTD1N33MERo6BOkWFTXZhpbegn7PrYvk7zD1GProxsbSPQ3ui75aXWF4PNn8jFAk_HLsc7J48_Nw8XV4vp2--tifb1wipuh_PccnPLVc4VeibriIJiTGn2Rhjvn0QiPQiqmgHkBNYRKVjowQLkyUsk5OT_c7VP3Z8Q82H3MDpsGWuzGbHm94v_soqBn_6G7bkxt-c7qulKaKz1B7ACVhHJOGGyf4h7Sm-XMTrHbKXY7xW4PsRfL9-NdyA6akKB1Mb_7tGBSSF24bwcuIuL7esWUFFz-BdamijQ</recordid><startdate>20061001</startdate><enddate>20061001</enddate><creator>Kaya, A.</creator><creator>Benakli, M.</creator><creator>Mallary, M.L.</creator><creator>Bain, J.A.</creator><general>IEEE</general><general>Institute of Electrical and Electronics Engineers</general><general>The Institute of Electrical and Electronics Engineers, Inc. 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Cases are considered where different regions of the head have different values of alpha, to examine where increased damping might offer benefits in head field rise time. It is found that increasing alpha in the pole region from 0.02 to 0.2 significantly improves both field rise time and amplitude at a drive frequency of 1 Gb/s. Similar increases in the damping of the yoke region and in the soft underlayer (SUL) did not yield nearly as significant improvements in field magnitudes or rise times, but was associated with reduced noise from the SUL. It is also noted for a monopole head design, that a SUL with higher magnetization-thickness product, M S t, is needed to achieve the desired field amplitude as compared to a shielded pole head. An improvement in the gradient of the field is observed for the shielded head design along with a reduction in the field magnitude</abstract><cop>New York, NY</cop><pub>IEEE</pub><doi>10.1109/TMAG.2006.879430</doi><tpages>3</tpages></addata></record> |
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| subjects | Amplitudes Anisotropic magnetoresistance Coils Cross-disciplinary physics: materials science rheology Damping Dynamic tests Dynamics Exact sciences and technology high-frequency recording Magnetic anisotropy Magnetic heads Magnetism Magnetostatic waves Materials science micromagnetic Micromagnetics Noise Other topics in materials science perpendicular head Perpendicular magnetic anisotropy Perpendicular magnetic recording Physics Poles Recording heads Saturation magnetization Yokes |
| title | A Micromagnetic Study of the Effect of Spatial Variations in Damping in Perpendicular Recording Heads |
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