Characterization of the Magnetic Properties of HAMR Media Using the Temperature Dependence of the AC Susceptibility
| Autor: | Paul C. Dorsey, Antony Ajan, M. Chapline, M. Desai, Cristian Papusoi, Ramamurthy Acharya |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics Anisotropy energy 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Magnetic susceptibility Temperature measurement Electronic Optical and Magnetic Materials Characterization (materials science) Magnetic anisotropy 0103 physical sciences Curie temperature Recording media Electrical and Electronic Engineering 0210 nano-technology Superparamagnetism |
| Zdroj: | IEEE Transactions on Magnetics. 52:1-4 |
| ISSN: | 1941-0069 0018-9464 |
| Popis: | The ac susceptibility of heat-assisted magnetic recording media was measured from room temperature to 750 K for the frequencies ranging from 500 Hz to 50 kHz. Using an analytical model for the ac susceptibility of weakly interacting uniaxial superparamagnetic particles, we were able to characterize the temperature dependence of the anisotropy energy ( $K$ ) distribution and the saturation magnetization ( $M_{s})$ near the Curie temperature ( $T_{c})$ . In addition, we were able to extract information about the dependence of Tc on the grain diameter. |
| Databáze: | OpenAIRE |
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