Flying-height reduction of magnetic-head slider due to thermal protrusion
Both the heat generated by the current in the write coil and the rise in the surrounding temperature cause local thermal protrusion (TPR) on magnetic-head elements. Such protrusion reduces the flying height of the head slider below the design value, thus reducing the safety margin for head-disk inte...
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| Veröffentlicht in: | IEEE transactions on magnetics 2005-10, Vol.41 (10), p.3007-3009 |
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| container_title | IEEE transactions on magnetics |
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| creator | Kurita, M. Junguo Xu Tokuyama, M. Nakamoto, K. Saegusa, S. Maruyama, Y. |
| description | Both the heat generated by the current in the write coil and the rise in the surrounding temperature cause local thermal protrusion (TPR) on magnetic-head elements. Such protrusion reduces the flying height of the head slider below the design value, thus reducing the safety margin for head-disk interference. To analyze this problem, we numerically simulated the heat transfer in the head slider, the thermal deformation of the head, and the flying-height change of the slider resulting from the deformation. The parameter study shows that decreasing the thickness of the alumina base coat or increasing the size of the pole and shields can reduce the magnitude of write-current-induced thermal protrusion (W-TPR). On the other hand, a longer pole and shields increase ambient-temperature-induced protrusion (T-TPR). For W-TPR, the reduced flying height is partly compensated by increased air pressure on the air-bearing surface (ABS). However, almost the entire magnitude of T-PTR translates into flying-height reduction. |
| doi_str_mv | 10.1109/TMAG.2005.855240 |
| format | Article |
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Such protrusion reduces the flying height of the head slider below the design value, thus reducing the safety margin for head-disk interference. To analyze this problem, we numerically simulated the heat transfer in the head slider, the thermal deformation of the head, and the flying-height change of the slider resulting from the deformation. The parameter study shows that decreasing the thickness of the alumina base coat or increasing the size of the pole and shields can reduce the magnitude of write-current-induced thermal protrusion (W-TPR). On the other hand, a longer pole and shields increase ambient-temperature-induced protrusion (T-TPR). For W-TPR, the reduced flying height is partly compensated by increased air pressure on the air-bearing surface (ABS). However, almost the entire magnitude of T-PTR translates into flying-height reduction.</description><identifier>ISSN: 0018-9464</identifier><identifier>EISSN: 1941-0069</identifier><identifier>DOI: 10.1109/TMAG.2005.855240</identifier><identifier>CODEN: IEMGAQ</identifier><language>eng</language><publisher>New York, NY: IEEE</publisher><subject>Analytical models ; Coils ; Cross-disciplinary physics: materials science; rheology ; Deformable models ; Exact sciences and technology ; Flying height ; Heat transfer ; Interference ; Magnetic analysis ; magnetic head slider ; Magnetic heads ; Magnetism ; Materials science ; Numerical simulation ; Other topics in materials science ; Physics ; Safety ; simulation ; Temperature ; thermal protrusion</subject><ispartof>IEEE transactions on magnetics, 2005-10, Vol.41 (10), p.3007-3009</ispartof><rights>2006 INIST-CNRS</rights><rights>Copyright The Institute of Electrical and Electronics Engineers, Inc. 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Such protrusion reduces the flying height of the head slider below the design value, thus reducing the safety margin for head-disk interference. To analyze this problem, we numerically simulated the heat transfer in the head slider, the thermal deformation of the head, and the flying-height change of the slider resulting from the deformation. The parameter study shows that decreasing the thickness of the alumina base coat or increasing the size of the pole and shields can reduce the magnitude of write-current-induced thermal protrusion (W-TPR). On the other hand, a longer pole and shields increase ambient-temperature-induced protrusion (T-TPR). For W-TPR, the reduced flying height is partly compensated by increased air pressure on the air-bearing surface (ABS). However, almost the entire magnitude of T-PTR translates into flying-height reduction.</description><subject>Analytical models</subject><subject>Coils</subject><subject>Cross-disciplinary physics: materials science; rheology</subject><subject>Deformable models</subject><subject>Exact sciences and technology</subject><subject>Flying height</subject><subject>Heat transfer</subject><subject>Interference</subject><subject>Magnetic analysis</subject><subject>magnetic head slider</subject><subject>Magnetic heads</subject><subject>Magnetism</subject><subject>Materials science</subject><subject>Numerical simulation</subject><subject>Other topics in materials science</subject><subject>Physics</subject><subject>Safety</subject><subject>simulation</subject><subject>Temperature</subject><subject>thermal protrusion</subject><issn>0018-9464</issn><issn>1941-0069</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2005</creationdate><recordtype>article</recordtype><sourceid>RIE</sourceid><recordid>eNqNkU1rGzEQhkVoIG6Se6CXpdDe1hl9rD6OwcRuIKWX5Cwk7aytsN5Npd2D_31kHAj00lxmGOZ5Z5h5CbmhsKQUzO3T77vNkgE0S900TMAZWVAjaA0gzReyAKC6NkKKC_I155dSiobCgjys-0MctvUO43Y3VQnbOUxxHKqxq_ZuO-AUQ2m6tsp9bDFV7YzVNFbTDtPe9dVrGqc056K4Iued6zNev-dL8ry-f1r9qh__bB5Wd491EMpMtcROc-ddR13LvPGdUp4HT0F4roLzjDfMCRNQIO-klKx16EsIrdegEfgl-XmaW1b_nTFPdh9zwL53A45ztsywRgFn_wd1-Rtn6hNgeaJWsoDf_wFfxjkN5VqrpRISClkgOEEhjTkn7OxrinuXDpaCPVplj1bZo1X2ZFWR_Hif63JwfZfcEGL-0CnGwTSicN9OXETEj3ZDDdWGvwG5OZzA</recordid><startdate>20051001</startdate><enddate>20051001</enddate><creator>Kurita, M.</creator><creator>Junguo Xu</creator><creator>Tokuyama, M.</creator><creator>Nakamoto, K.</creator><creator>Saegusa, S.</creator><creator>Maruyama, Y.</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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Such protrusion reduces the flying height of the head slider below the design value, thus reducing the safety margin for head-disk interference. To analyze this problem, we numerically simulated the heat transfer in the head slider, the thermal deformation of the head, and the flying-height change of the slider resulting from the deformation. The parameter study shows that decreasing the thickness of the alumina base coat or increasing the size of the pole and shields can reduce the magnitude of write-current-induced thermal protrusion (W-TPR). On the other hand, a longer pole and shields increase ambient-temperature-induced protrusion (T-TPR). For W-TPR, the reduced flying height is partly compensated by increased air pressure on the air-bearing surface (ABS). However, almost the entire magnitude of T-PTR translates into flying-height reduction.</abstract><cop>New York, NY</cop><pub>IEEE</pub><doi>10.1109/TMAG.2005.855240</doi><tpages>3</tpages></addata></record> |
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| subjects | Analytical models Coils Cross-disciplinary physics: materials science rheology Deformable models Exact sciences and technology Flying height Heat transfer Interference Magnetic analysis magnetic head slider Magnetic heads Magnetism Materials science Numerical simulation Other topics in materials science Physics Safety simulation Temperature thermal protrusion |
| title | Flying-height reduction of magnetic-head slider due to thermal protrusion |
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