ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The topic of demagnetization has always been considered important to the area of magnetics in general. Whether it is required to characterize the initial permeability of a premagnetized sample or to erase, nondestructively, previously recorded data on disks or tapes, demagnetization processes are indispensable. Theoretically, demagnetization can be achieved by applying infinite ac field cycles with slowly decaying amplitudes. In practice, however, only a finite subset of this sequence may be applied. As a result, achieving the demagnetized state, or even a zero residual magnetization state, becomes uncertain. The purpose of this paper is to present an efficient Preisach-type demagnetization algorithm that can lead to a zero residual magnetization state within few field cycles. While this state might not fully match the demagnetized state, it can be regarded as a good approximation especially for data erasure applications. The algorithm has been experimentally tested and compared to particular demagnetization techniques employing finite ac field cycles with decaying amplitudes. Some sample results of this experimental testing are reported in the paper.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.355670
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