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Optimum thickness of soft magnetic phase in FePt/FeCo permanent magnet superlattices with high energy product and large magnetic anisotropy energy
5. We thank one of the referees for bringing to our attention a very recent work (G. Giannopoulos, L. Reichel, A. Markou, I. Panagiotopoulos, V. Psycharis, C. Damm, S. Fähler, I. Khan, J. Hong and D. Niarchos, J. Appl. Phys. 117, 223909 (2015)) on FeCo layers deposited on FePt few layers with similar conclusions as we find. However, they also find anti-ferromagnetic coupling which leads to a decrease in the total magnetic moments beyond a certain number of FeCo layers in contrast to ferromagnetic coupling we have obtained for superlattices.
14.G. Giannopoulos, G., R. Salikhov, B. Zingsem, A. Markou, I. Panagiotopoulos, V. Psycharis, M. Farle, and D. Niarchos, APL Materials 3, 041103 (2015).
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Ab initio calculations on hard/soft (FePt)m/(FeCo)n, (m = 4, 6, 8 and n = 2-2m) magnetic superlattices show that the B2 type FeCo layers become anisotropic with varying interlayer spacing and enhanced magnetic moments. The average magnetic moment in superlattices is higher than in bulk FePt, resulting in high maximum energy product for (FePt)4/(FeCo)8 which is nearly double the calculated value for bulk FePt. The calculation of the magnetic anisotropy energy shows that the optimal thickness of the soft magnetic phase for good permanent magnet behaviour of the superlattice is less than ∼2 nm.
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