Confinement Effects of Hard Disk Lubricant Investigation by Atomic Force Microscopy
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1025-B08-10
Confinement Effects of Hard Disk Lubricant Investigation by Atomic Force Microscopy George L Caia1, Cynthia Buenviaje-Coggins1, Nicole Munoz1, David Faddis1, Doru I Florescu1, Sung Park1, and SungChang Lee2 1 Advanced Technology, Park Systems, 3040 Olcott St., Santa Clara, CA, 95054 2 Samsung Information Systems America, Samsung, 75 West Plumeria Dr., San Jose, CA, 95125 Confinement Effects of Hard Disk Lubricant Investigation by Atomic Force Microscopy George L Caia1, Cynthia Buenviaje-Coggings1, Nicole Munoz1, David Faddis1, Doru I Florescu1, Sung Park1, and SungChang Lee2 1 Advanced Technology, Park Systems, 3040 Olcott St., Santa Clara, CA, 95129 2 Samsung Information Systems America, Samsung, 75 West Plumeria Dr., San Jose, CA, 95125 ABSTRACT As the critical design requirements decrease in modern day applications, we need to understand how confinement affects the performance of the materials we use to develop such applications. For example, the lubricant used on magnetic recording disks to reduce wear between the disk and head reader during unexpected intermittent contact is a good candidate to evaluate since this pertains to an application at the nanoscale. Lubricants used in hard drives need to have sufficient reflow and redistribution properties, which are stable in a wide range of temperatures experienced in today’s hard drive applications. Since the materials properties of the confined system often differ from the bulk properties, tools to properly investigate these systems need to be developed and understood. In this study, we utilized atomic force microscopy (AFM) techniques to study the confinement effects and lubricant stability with temperature. Our studies have demonstrated distinct changes in adhesion force with changes in the thickness of the confining substrate layer. As adhesion is a component of friction, these changes in adhesion are directly related to lubricant performance and its ability to reduce wear between disk and reader with significant implications on device design considerations. INTRODUCTION/BACKGROUND The hard disk drives industry experienced a tremendous increase in the storage rate densities through the last decade. This phenomenon has placed tight demands on materials used for the manufacturing of related applications. One method of increasing the recording density is the decreasing of the distance between the active elements of the drive. The fly height of the recording head relative to the magnetic media has been decreased resulting in wearing of the recording disk, in spite of the fact that these active elements are not in immediate contact with one another. These recent developments lead to protective films requirement at the head-disk interface. These lubricants used on hard drive disk surface have to be studied and parameters associated with reflow and retention rates have to be mapped against temperature variation of the head – disk system. The lubricants must easily spread over a surface and yet must adhere to the disk as it spins. As the temperature varies
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