### Abstract

A one-dimensional theory of magnetization reversal in thin, perpendicularly anisotropic magnetic films is presented. It is postulated that the presence of a defective point creates an infinitely deep, infinitely narrow potential well which inhibits the rotation of local magnetization. The interval D between neighboring defects, the saturation magnetization M//s, the anisotropy constant K//u, and the exchange energy constant A are assumed to be finite and uniform across the film. Starting with an initial state where the film is uniformly magnetized to saturation in the easy direction, we show that a discontinuous change of state occurs when the reverse external field H reaches a critical value H//c. The domains thus nucleated at the critical field expand to cover the entire area of the film as H increases beyond H//c. Using the normalized values of H and D, defined, respectively, as h equals H/(2K//u/M//s) and d equals D/(4A/K//u)**1**/**2, it is shown that the critical field h//c is a function only of d and that its value decreases significantly as d increases.

Original language | English (US) |
---|---|

Pages (from-to) | 1660-1663 |

Number of pages | 4 |

Journal | Journal of Applied Physics |

Volume | 53 |

Issue number | 3 pt 1 |

DOIs | |

State | Published - Mar 1982 |

Externally published | Yes |

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### ASJC Scopus subject areas

- Physics and Astronomy(all)
- Physics and Astronomy (miscellaneous)

### Cite this

**MAGNETIZATION REVERSAL IN THIN MAGNETIC FILMS WITH PERPENDICULAR ANISOTROPY.** / Mansuripur, Masud.

Research output: Contribution to journal › Article

*Journal of Applied Physics*, vol. 53, no. 3 pt 1, pp. 1660-1663. https://doi.org/10.1063/1.331628

}

TY - JOUR

T1 - MAGNETIZATION REVERSAL IN THIN MAGNETIC FILMS WITH PERPENDICULAR ANISOTROPY.

AU - Mansuripur, Masud

PY - 1982/3

Y1 - 1982/3

N2 - A one-dimensional theory of magnetization reversal in thin, perpendicularly anisotropic magnetic films is presented. It is postulated that the presence of a defective point creates an infinitely deep, infinitely narrow potential well which inhibits the rotation of local magnetization. The interval D between neighboring defects, the saturation magnetization M//s, the anisotropy constant K//u, and the exchange energy constant A are assumed to be finite and uniform across the film. Starting with an initial state where the film is uniformly magnetized to saturation in the easy direction, we show that a discontinuous change of state occurs when the reverse external field H reaches a critical value H//c. The domains thus nucleated at the critical field expand to cover the entire area of the film as H increases beyond H//c. Using the normalized values of H and D, defined, respectively, as h equals H/(2K//u/M//s) and d equals D/(4A/K//u)**1**/**2, it is shown that the critical field h//c is a function only of d and that its value decreases significantly as d increases.

AB - A one-dimensional theory of magnetization reversal in thin, perpendicularly anisotropic magnetic films is presented. It is postulated that the presence of a defective point creates an infinitely deep, infinitely narrow potential well which inhibits the rotation of local magnetization. The interval D between neighboring defects, the saturation magnetization M//s, the anisotropy constant K//u, and the exchange energy constant A are assumed to be finite and uniform across the film. Starting with an initial state where the film is uniformly magnetized to saturation in the easy direction, we show that a discontinuous change of state occurs when the reverse external field H reaches a critical value H//c. The domains thus nucleated at the critical field expand to cover the entire area of the film as H increases beyond H//c. Using the normalized values of H and D, defined, respectively, as h equals H/(2K//u/M//s) and d equals D/(4A/K//u)**1**/**2, it is shown that the critical field h//c is a function only of d and that its value decreases significantly as d increases.

UR - http://www.scopus.com/inward/record.url?scp=0020101799&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0020101799&partnerID=8YFLogxK

U2 - 10.1063/1.331628

DO - 10.1063/1.331628

M3 - Article

AN - SCOPUS:0020101799

VL - 53

SP - 1660

EP - 1663

JO - Journal of Applied Physics

JF - Journal of Applied Physics

SN - 0021-8979

IS - 3 pt 1

ER -