Magnetic force microscopy: General principles and application to longitudinal recording media
| Autor: | Harry Jonathon Mamin, Daniel Rugar, I. R. McFadyen, S. E. Lambert, T. Yogi, J. E. Stern, Peter Hermann Guethner |
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| Rok vydání: | 1990 |
| Předmět: | |
| Zdroj: | Journal of Applied Physics. 68:1169-1183 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.346713 |
| Popis: | This paper discusses the principles of magnetic force microscopy (MFM) and its application to magnetic recording studies. We use the ac detection method which senses the force gradient acting on a small magnetic tip due to fields emanating from the domain structure in the sample. Tip fabrication procedures are described for two types of magnetic tips: etched tungsten wires with a sputter‐deposited magnetic coating and etched nickel wires. The etched nickel wires are shown to have an apex radius on the order of 30 nm and a taper half‐angle of approximately 3°. Lorentz‐mode transmission electron microscopy of the nickel tips reveals that the final 20 μm is essentially single domain with magnetization approximately parallel with the tip axis. Images of written bit transitions are presented for several types of magnetic media, including CoPtCr, CoSm, and CoCr thin films, as well as γ‐Fe2O3 particulate media. In general, the written magnetization patterns are seen with high contrast and with resolution better ... |
| Databáze: | OpenAIRE |
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