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The role of dipolar interactions for the determination of intrinsic switching field distributions
Appl. Phys. Lett. 92, 222503 (2008); doi:10.1063/1.2938695
Published 3 June 2008
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H(M,M) method and its ability to determine intrinsic switching field distributions of perpendicular recording media are numerically studied. It is found that the presence of dipolar interactions in the range of typical recording media substantially enhances the reliability of the H(M,M) method. In addition, a strong correlation is observed between the precision of this method and a self-consistency check of the data sets, which is based upon a simple redundancy measure. This suggests that the latter can be utilized as an efficient criterion to decide if a complete data analysis is warranted or not.
©2008 American Institute of Physics
H(M,M) method and its ability to determine intrinsic switching field distributions of perpendicular recording media are numerically studied. It is found that the presence of dipolar interactions in the range of typical recording media substantially enhances the reliability of the H(M,M) method. In addition, a strong correlation is observed between the precision of this method and a self-consistency check of the data sets, which is based upon a simple redundancy measure. This suggests that the latter can be utilized as an efficient criterion to decide if a complete data analysis is warranted or not.
©2008 American Institute of Physics
| History: | Received 5 March 2008; accepted 10 May 2008; published 3 June 2008 |
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REFERENCES (13)
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- The lattice constant by itself is not relevant in our model, because it is effectively included in Jdp. A quantitative comparison with real granular geometries can easily be done, if the corresponding Hamiltonian is written into a functional form similar to ours.
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Physica A 176, 485 (1991) . - For recoil curve pair (i,j), the deviation from redundancy is defined as rij(M)=[Hi(M)+Hj(M−Mj)−Hi(M−Mj)−Hj(M−Mj+Mi)]/[Hi(M)+Hj(M−Mj)+Hi(M−Mj)+Hj(M−Mj+Mi)]. In mean field theory, it can be exactly proven that rij(M)=0. For details, see Ref. 9.
