A reversed gyromagnetic effect in chromium dioxide particles
The gyromagnetic properties of CrO 2 recording particles have been investigated and compared to those of γ-Fe 2O 3, which have previously been subject to similar studies. Rotational remanent magnetization (RRM) was determined as a function of rotation speed and of the strength of the magnetizing alt...
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| Published in | Journal of magnetism and magnetic materials Vol. 260; no. 1; pp. 131 - 140 |
|---|---|
| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
Amsterdam
Elsevier B.V
01.03.2003
Elsevier Science |
| Subjects | |
| Online Access | Get full text |
| ISSN | 0304-8853 |
| DOI | 10.1016/S0304-8853(02)01238-6 |
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| Abstract | The gyromagnetic properties of CrO
2 recording particles have been investigated and compared to those of γ-Fe
2O
3, which have previously been subject to similar studies. Rotational remanent magnetization (RRM) was determined as a function of rotation speed and of the strength of the magnetizing alternating field (AF). Gyromagnetic remanent magnetization (GRM) acquired by anisotropic samples in a static experiment was measured for various peak AF as a function of the angle between the AF and the axis of anisotropy. The asymmetry of GRM curves obtained with non-saturating fields may be related to the incoherent reversal mode of the particles. While GRM (RRM) of the γ-Fe
2O
3 particles had the sign expected theoretically, the gyromagnetic remanences obtained for CrO
2 in both types of experiments were of opposite signs. Possible reasons for the reversed gyromagnetic effect are discussed. |
|---|---|
| AbstractList | The gyromagnetic properties of CrO
2 recording particles have been investigated and compared to those of γ-Fe
2O
3, which have previously been subject to similar studies. Rotational remanent magnetization (RRM) was determined as a function of rotation speed and of the strength of the magnetizing alternating field (AF). Gyromagnetic remanent magnetization (GRM) acquired by anisotropic samples in a static experiment was measured for various peak AF as a function of the angle between the AF and the axis of anisotropy. The asymmetry of GRM curves obtained with non-saturating fields may be related to the incoherent reversal mode of the particles. While GRM (RRM) of the γ-Fe
2O
3 particles had the sign expected theoretically, the gyromagnetic remanences obtained for CrO
2 in both types of experiments were of opposite signs. Possible reasons for the reversed gyromagnetic effect are discussed. |
| Author | Madsen, Karen Nørgaard |
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| Cites_doi | 10.1111/j.1365-246X.1972.tb05815.x 10.1111/j.1365-246X.1987.tb00735.x 10.1088/0022-3735/13/3/017 10.1111/j.1365-246X.1980.tb04847.x 10.1098/rsta.1948.0007 10.1109/TMAG.1986.1064292 10.1080/01418638108223770 10.1109/TMAG.1987.1065524 10.1080/13642818808211247 10.1038/284049a0 10.1038/284048a0 10.1111/j.1365-246X.1986.tb04351.x 10.1111/j.1365-246X.1976.tb01279.x 10.1016/S0304-8853(01)01392-0 10.1111/j.1365-246X.1990.tb01781.x 10.1002/pssb.19660160102 10.1111/j.1365-246X.1986.tb06638.x |
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| Keywords | Recording particles GRM RRM Chromium dioxide Maghemite Inorganic compounds Alternating field Transition element compounds Magnetic moments Binary compounds Experimental study Gyromagnetic effect Magnetic particles Asymmetry Remanent magnetization Anisotropy Chromium oxides Recording material |
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Soc. doi: 10.1111/j.1365-246X.1976.tb01279.x – volume: 241 start-page: 220 year: 2002 ident: 10.1016/S0304-8853(02)01238-6_BIB12 article-title: Angular dependence of switching field measured on maghemite recording particles publication-title: J. Magn. Magn. Mater. doi: 10.1016/S0304-8853(01)01392-0 – start-page: 3.1 year: 1996 ident: 10.1016/S0304-8853(02)01238-6_BIB14 article-title: Particulate media – volume: 103 start-page: 425 year: 1990 ident: 10.1016/S0304-8853(02)01238-6_BIB17 article-title: The anomalous demagnetization of pyrrhotite publication-title: Geophys. J. Int. doi: 10.1111/j.1365-246X.1990.tb01781.x – year: 1963 ident: 10.1016/S0304-8853(02)01238-6_BIB16 – volume: 16 start-page: 3 year: 1966 ident: 10.1016/S0304-8853(02)01238-6_BIB19 article-title: Magnetization curling publication-title: Phys. Stat. Sol. doi: 10.1002/pssb.19660160102 – volume: 87 start-page: 569 year: 1986 ident: 10.1016/S0304-8853(02)01238-6_BIB11 article-title: The detection of fine particles of magnetite using anhysteretic and rotational remanent magnetizations publication-title: Geophys. J. R. Astron. Soc. doi: 10.1111/j.1365-246X.1986.tb06638.x |
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| Snippet | The gyromagnetic properties of CrO
2 recording particles have been investigated and compared to those of γ-Fe
2O
3, which have previously been subject to... |
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| SubjectTerms | Chromium dioxide Condensed matter: electronic structure, electrical, magnetic, and optical properties Exact sciences and technology GRM Maghemite Magnetic properties and materials Magnetic recording materials Magnetically ordered materials: other intrinsic properties Physics Recording particles RRM Saturation moments and magnetic susceptibilities Studies of specific magnetic materials |
| Title | A reversed gyromagnetic effect in chromium dioxide particles |
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