Imaging the equilibrium state and magnetization dynamics of partially built hard disk write heads
| Autor: | T. H. J. Loughran, Peter Czoschke, M. A. Bashir, R. A. J. Valkass, G. van der Laan, L. R. Shelford, Paul Steven Keatley, Stuart A. Cavill, R. J. Hicken, Radek Lopusnik, W. Yu, Mark Anthony Gubbins, Sarnjeet S. Dhesi |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Applied Physics Letters. 106:232404 |
| ISSN: | 1077-3118 0003-6951 |
| Popis: | Four different designs of partially built hard disk write heads with a yoke comprising four repeats of NiFe (1 nm)/CoFe (50 nm) were studied by both x-ray photoemission electron microscopy (XPEEM) and time-resolved scanning Kerr microscopy (TRSKM). These techniques were used to investigate the static equilibrium domain configuration and the magnetodynamic response across the entire structure, respectively. Simulations and previous TRSKM studies have made proposals for the equilibrium domain configuration of similar structures, but no direct observation of the equilibrium state of the writers has yet been made. In this study, static XPEEM images of the equilibrium state of writer structures were acquired using x-ray magnetic circular dichroism as the contrast mechanism. These images suggest that the crystalline anisotropy dominates the equilibrium state domain configuration, but competition with shape anisotropy ultimately determines the stability of the equilibrium state. Dynamic TRSKM images were acquire... |
| Databáze: | OpenAIRE |
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