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21 Dec 1998

Volume 73, Issue 25, pp. 3629-3786

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Micromagnetic tailoring of periodic antidot permalloy arrays for high density storage

L. Torres, L. Lopez-Diaz, and J. Iñiguez

Appl. Phys. Lett. 73, 3766 (1998); http://dx.doi.org/10.1063/1.122888 (3 pages) | Cited 51 times

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A micromagnetic study on antidot permalloy arrays is carried out in order to delimit their possibilities for high density storage. The dependence of the recorded bit quality on antidot size, separation distance, and film thickness is reported as well as hysteresis loops and coercivities. The simulations show a limit for the antidot size around 80 nm leading to maximum areal storage densities of about 10 Gbits/in2. The results are interpreted in terms of demagnetizing, anisotropy, and exchange energies’ balance. © 1998 American Institute of Physics.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.50.Ss Magnetic recording materials
75.50.Bb Fe and its alloys
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
85.70.Kh Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.); domain-motion devices, etc.
75.30.Gw Magnetic anisotropy
75.30.Et Exchange and superexchange interactions

Nonlinear magneto-optical Kerr effect and second harmonic generation interferometry in Co–Cu granular films

T. V. Murzina, E. A. Ganshina, S. V. Guschin, T. V. Misuryaev, and O. A. Aktsipetrov

Appl. Phys. Lett. 73, 3769 (1998); http://dx.doi.org/10.1063/1.122889 (3 pages) | Cited 11 times

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Magnetoinduced effects in second harmonic (SH) generation are experimentally studied in the CoxCu1−x granular films. Significant nonlinear magneto-optical Kerr effect (NOMOKE) is observed both in longitudinal and transverse configurations. The interference of the SH fields generated by the interface and bulk, nonmagnetic and magnetoinduced nonlinear polarizations is discussed as a mechanism of NOMOKE enhancement. The bulk nonmagnetic dipole quadratic susceptibility of Co nanocrystals stems from the lack of inversion symmetry in the Co granules. © 1998 American Institute of Physics.
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42.65.Ky Frequency conversion; harmonic generation, including higher-order harmonic generation
78.66.Bz Metals and metallic alloys
78.20.Ls Magneto-optical effects
75.50.Kj Amorphous and quasicrystalline magnetic materials

Neutron diffraction evidence for a new ferromagnetic phase in Cr doped Pr0.5Ca0.5MnO3

F. Damay, C. Martin, A. Maignan, M. Hervieu, B. Raveau, F. Bourée, and G. André

Appl. Phys. Lett. 73, 3772 (1998); http://dx.doi.org/10.1063/1.122890 (3 pages) | Cited 47 times

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Cr doping in Pr0.5Ca0.5MnO3 is known to destroy the low-temperature antiferromagnetic charge-ordered state and to induce a ferromagnetic component as well as colossal magnetoresistance properties. Effects of Cr doping on the magnetic and nuclear structures are studied here by neutron diffraction for Pr0.5Ca0.5Mn0.95Cr0.05O3. It is shown that, at low temperature, the strongly distorted charge ordered structure usually observed in Pr0.5Ca0.5MnO3 is replaced by a ferromagnetic phase in which the basal-plane distortion of the MnO6 octahedra has disappeared, in agreement with the restoration of the double–exchange interactions. © 1998 American Institute of Physics.
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75.25.-j Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)
75.50.Ee Antiferromagnetics
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
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