### Abstract

Cooperative and noncooperative magnetization processes in magnetic nanostructures are investigated. Using model calculations it is shown that the Preisach model and related approaches, such as Henkel, ΔM, and ΔH plots, describe magnetism on a mean-field level and cannot account for intra- and inter-granular cooperative effects. For example, the ΔM plot of a nucleation-controlled two-domain particle gives the false impression of a positive intergranular interaction. A simple but nontrivial cooperative model, consisting of two interacting but nonequivalent particles, is used to show that cooperative effects are most pronounced for narrow switching-field distributions, i.e., for nearly rectangular loops. This is unfavorable from the point of magnetic recording, where one aims at combining narrow loops with a noncooperative local switching behavior. A general rule is that the neglect of cooperative effects leads to an overestimation of the coercivity.

Original language | English (US) |
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Pages (from-to) | 7263-7265 |

Number of pages | 3 |

Journal | Journal of Applied Physics |

Volume | 89 |

Issue number | 11 II |

DOIs | |

State | Published - Jun 1 2001 |

Event | 8th Joint Magnetism and Magnetic Materials-Intermag Conference - San Antonio, TX, United States Duration: Jan 7 2001 → Jan 11 2001 |

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### ASJC Scopus subject areas

- Physics and Astronomy(all)

### Cite this

*Journal of Applied Physics*,

*89*(11 II), 7263-7265. https://doi.org/10.1063/1.1355344

**Cooperative magnetism and the Preisach model.** / Skomski, R.; Sellmyer, David J.

Research output: Contribution to journal › Conference article

*Journal of Applied Physics*, vol. 89, no. 11 II, pp. 7263-7265. https://doi.org/10.1063/1.1355344

}

TY - JOUR

T1 - Cooperative magnetism and the Preisach model

AU - Skomski, R.

AU - Sellmyer, David J

PY - 2001/6/1

Y1 - 2001/6/1

N2 - Cooperative and noncooperative magnetization processes in magnetic nanostructures are investigated. Using model calculations it is shown that the Preisach model and related approaches, such as Henkel, ΔM, and ΔH plots, describe magnetism on a mean-field level and cannot account for intra- and inter-granular cooperative effects. For example, the ΔM plot of a nucleation-controlled two-domain particle gives the false impression of a positive intergranular interaction. A simple but nontrivial cooperative model, consisting of two interacting but nonequivalent particles, is used to show that cooperative effects are most pronounced for narrow switching-field distributions, i.e., for nearly rectangular loops. This is unfavorable from the point of magnetic recording, where one aims at combining narrow loops with a noncooperative local switching behavior. A general rule is that the neglect of cooperative effects leads to an overestimation of the coercivity.

AB - Cooperative and noncooperative magnetization processes in magnetic nanostructures are investigated. Using model calculations it is shown that the Preisach model and related approaches, such as Henkel, ΔM, and ΔH plots, describe magnetism on a mean-field level and cannot account for intra- and inter-granular cooperative effects. For example, the ΔM plot of a nucleation-controlled two-domain particle gives the false impression of a positive intergranular interaction. A simple but nontrivial cooperative model, consisting of two interacting but nonequivalent particles, is used to show that cooperative effects are most pronounced for narrow switching-field distributions, i.e., for nearly rectangular loops. This is unfavorable from the point of magnetic recording, where one aims at combining narrow loops with a noncooperative local switching behavior. A general rule is that the neglect of cooperative effects leads to an overestimation of the coercivity.

UR - http://www.scopus.com/inward/record.url?scp=0035356426&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035356426&partnerID=8YFLogxK

U2 - 10.1063/1.1355344

DO - 10.1063/1.1355344

M3 - Conference article

VL - 89

SP - 7263

EP - 7265

JO - Journal of Applied Physics

JF - Journal of Applied Physics

SN - 0021-8979

IS - 11 II

ER -