The Magnetization of Ferromagnetic Colloids
| Autor: | W. C. Elmore |
|---|---|
| Rok vydání: | 1938 |
| Předmět: |
Physics
Magnetic domain Ferromagnetic material properties Condensed matter physics General Physics and Astronomy Condensed Matter::Soft Condensed Matter Condensed Matter::Materials Science chemistry.chemical_compound Paramagnetism Magnetization chemistry Ferromagnetism Remanence Saturation (magnetic) Magnetite |
| Zdroj: | Physical Review. 54:1092-1095 |
| ISSN: | 0031-899X |
| DOI: | 10.1103/physrev.54.1092 |
| Popis: | The magnetization curves of colloidal magnetite (${\mathrm{Fe}}_{3}$${\mathrm{O}}_{4}$) and colloidal siderac ($\ensuremath{\gamma}$-${\mathrm{Fe}}_{2}$${\mathrm{O}}_{3}$) have been determined by a null method for fields from 0 to 400 gauss. The measured curves have been found to agree with a theoretical curve based on the following assumptions: (1) Each colloid particle is a permanent magnet. This assumption is in accord with a prediction of the theory of ferromagnetism that small ferromagnetic particles be single magnetic domains. (2) There exists a distribution in the size of the particle moments similar to the weight distributions which have been found for other colloids. (3) The particles behave as the molecules of a classical paramagnetic gas. On this basis the average particle moment is found to be ${5.2(10)}^{\ensuremath{-}16}$ for the magnetite sol and ${7.4(10)}^{\ensuremath{-}16}$ for the siderac sol. Several other quantities related to the colloids are briefly discussed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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