Characterization of thermally actuated pole tip protrusion for head-media spacing adjustment in hard disk drives / Sung-Chang Lee in Transactions of the ASME . Journal of tribology, Vol. 130 n°2 (Mars/Avril 2008)  

Public ISBD [article]  inTransactions of the ASME . Journal of tribology > Vol. 130 n°2 (Mars/Avril 2008) . - 6 p. Titre : Characterization of thermally actuated pole tip protrusion for head-media spacing adjustment in hard disk drives Type de document : texte imprimé Auteurs : Sung-Chang Lee, Auteur ; Brian D. Strom, Auteur Année de publication : 2008 Article en page(s) : 6 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Thermomechanically actuated pole tip Hard disk drive Résumé : The effect of thermomechanically actuated pole tip protrusion on adhesive forces is characterized through model and experiment. The roughness of a thermomechanically actuated region is characterized by atomic force microscopy. Using the extracted roughness parameters and estimated apparent area associated with thermal actuation, the intermolecular forces at the head-disk interface (HDI) are calculated using the ISBL (improved sub-boundary lubrication) code. Both roughness and nominal area of contact are found to be significant factors determining adhesive forces. The adhesive forces for various HDI designs—including thermal actuation—are also characterized experimentally in situ using commercial hard disk drive samples. The experimental results are found to be consistent with the model calculations and imply certain advantages for thermally actuated HDI designs. However, the experiments also raise concerns regarding the field application of the technology. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468039 [article] Characterization of thermally actuated pole tip protrusion for head-media spacing adjustment in hard disk drives [texte imprimé] / Sung-Chang Lee, Auteur ; Brian D. Strom, Auteur . - 2008 . - 6 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 130 n°2 (Mars/Avril 2008) . - 6 p. Mots-clés : Thermomechanically actuated pole tip Hard disk drive Résumé : The effect of thermomechanically actuated pole tip protrusion on adhesive forces is characterized through model and experiment. The roughness of a thermomechanically actuated region is characterized by atomic force microscopy. Using the extracted roughness parameters and estimated apparent area associated with thermal actuation, the intermolecular forces at the head-disk interface (HDI) are calculated using the ISBL (improved sub-boundary lubrication) code. Both roughness and nominal area of contact are found to be significant factors determining adhesive forces. The adhesive forces for various HDI designs—including thermal actuation—are also characterized experimentally in situ using commercial hard disk drive samples. The experimental results are found to be consistent with the model calculations and imply certain advantages for thermally actuated HDI designs. However, the experiments also raise concerns regarding the field application of the technology. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468039

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Predicting air bearing contamination using air flow pattern analysis / Shuyu Zhang in Transactions of the ASME . Journal of tribology, Vol. 130 N°1 (Janvier 2008)  

Public ISBD [article]  inTransactions of the ASME . Journal of tribology > Vol. 130 N°1 (Janvier 2008) . - 4 p. Titre : Predicting air bearing contamination using air flow pattern analysis Type de document : texte imprimé Auteurs : Shuyu Zhang, Auteur ; Brian D. Strom, Auteur Année de publication : 2008 Article en page(s) : 4 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Flow (Dynamics) Particulate matter Air flow Contamination Bearings Disks Mechanisms Résumé : A new method is introduced for predicting particle and liquid droplet contamination on an air bearing surface. The method primarily relies on the analysis of flow patterns nearest the air bearing surface, restricted to two dimensions. In addition, a mathematical model for the vertical flow perpendicular to the disk surface adds clarity to the contamination mechanisms. The predictions compare well with contamination patterns observed in prototype disk drives. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleID=1467959 [article] Predicting air bearing contamination using air flow pattern analysis [texte imprimé] / Shuyu Zhang, Auteur ; Brian D. Strom, Auteur . - 2008 . - 4 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 130 N°1 (Janvier 2008) . - 4 p. Mots-clés : Flow (Dynamics) Particulate matter Air flow Contamination Bearings Disks Mechanisms Résumé : A new method is introduced for predicting particle and liquid droplet contamination on an air bearing surface. The method primarily relies on the analysis of flow patterns nearest the air bearing surface, restricted to two dimensions. In addition, a mathematical model for the vertical flow perpendicular to the disk surface adds clarity to the contamination mechanisms. The predictions compare well with contamination patterns observed in prototype disk drives. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleID=1467959

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