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26 Jan 1998

Volume 72, Issue 4, pp. 395-509

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High energy products in rapidly annealed nanoscale Fe/Pt multilayers

J. P. Liu, C. P. Luo, Y. Liu, and D. J. Sellmyer

Appl. Phys. Lett. 72, 483 (1998); http://dx.doi.org/10.1063/1.120793 (3 pages) | Cited 152 times

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Magnetic properties of nanocomposite Fe–Pt films with Fe concentration higher than 50 at % have been investigated in this study. Fe/Pt multilayers were produced by sputtering and magnetic hardening was observed after heat treatment including rapid annealing. The final nanocomposite films consisted of the hard face-centered tetragonal FePt phase and a soft face-centered-cubic phase. The maximum energy products of the optimally processed samples exceeded 40 MGOe. Evidence for exchange coupling of the hard and soft phases was found. © 1998 American Institute of Physics.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.50.Kj Amorphous and quasicrystalline magnetic materials
75.50.Vv High coercivity materials
81.40.Rs Electrical and magnetic properties related to treatment conditions
75.50.Bb Fe and its alloys
75.30.Et Exchange and superexchange interactions
81.40.Gh Other heat and thermomechanical treatments

Large magnetoresistance in La0.7Sr0.3MnO3/SrTiO3/La0.7Sr0.3MnO3 ramp-edge junctions

C. Kwon, Q. X. Jia, Y. Fan, M. F. Hundley, D. W. Reagor, J. Y. Coulter, and D. E. Peterson

Appl. Phys. Lett. 72, 486 (1998); http://dx.doi.org/10.1063/1.120794 (3 pages) | Cited 48 times

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We report on the fabrication of ferromagnet–insulator–ferromagnet junction devices using a ramp-edge geometry based on (La0.7Sr0.3)MnO3 ferromagnetic electrodes and a SrTiO3 insulator. The maximum junction magnetoresistance (JMR) as large as 23% is observed below 300 Oe at low temperatures (T<100 K). Our ramp-edge junctions exhibit JMR of 6% at 200 K with a field less than 100 Oe. The device performance at room temperature is believed to be limited by both the nearly equivalent coercive fields in the electrodes and the magnetization process, rather than by the insulating barrier. © 1998 American Institute of Physics.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.47.De Giant magnetoresistance
73.61.At Metal and metallic alloys
72.15.Gd Galvanomagnetic and other magnetotransport effects
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
75.50.Dd Nonmetallic ferromagnetic materials

Magnetostriction in twin-free single crystals TbyDy1−yFe2 with the addition of aluminum or manganese

J. Du, J. H. Wang, C. C. Tang, Y. X. Li, G. H. Wu, and W. S. Zhan

Appl. Phys. Lett. 72, 489 (1998); http://dx.doi.org/10.1063/1.120804 (3 pages) | Cited 6 times

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Magnetostriction at room temperature under various conditions of compressive prestress and applied fields of TbyDy1−y(Fe1−xTx)2 (T=Al, Mn) twin-free single crystals was investigated. The substitution of Al or Mn for Fe lowers the magnetostriction under ordinary temperature and pressure, and decreases the saturation field, which enables these materials with potential benefits for applications. Moreover, Tb0.5Dy0.5(Fe0.9Mn0.1)2 shows negative magnetostriction at room temperature under zero prestress, due to the rotation of domains 109.5° away from 〈111〉. Under appropriate compressive stress, a quite large magnetostriction of 2160 ppm with a saturation field of 900 Oe and high d33 of 4.8 ppm/Oe can be obtained. © 1998 American Institute of Physics.
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75.80.+q Magnetomechanical effects, magnetostriction

Thermally assisted reversal of exchange biasing in NiO and FeMn based systems

P. A. A. van der Heijden, T. F. M. M. Maas, W. J. M. de Jonge, J. C. S. Kools, F. Roozeboom, and P. J. van der Zaag

Appl. Phys. Lett. 72, 492 (1998); http://dx.doi.org/10.1063/1.120795 (3 pages) | Cited 66 times

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The stability of the exchange bias field Heb has been studied for magnetron sputtered NiO/Ni66Co18Fe16 and Ni66Co18Fe16/FeMn bilayers. A forced antiparallel alignment of the ferromagnetic magnetization to Heb results in a gradual decrease of Heb as a function of time for NiO as well as FeMn based samples. The observed decrease of Heb increases with temperature and is interpreted as a thermally assisted reversal of magnetic domains in the antiferromagnetic layer. © 1998 American Institute of Physics.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.30.Et Exchange and superexchange interactions
75.50.Bb Fe and its alloys
75.50.Ee Antiferromagnetics
75.70.Kw Domain structure (including magnetic bubbles and vortices)
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Measurement of perpendicular giant magnetoresistance of Fe/Si superlattices

Yasushi Endo, Osamu Kitakami, and Yutaka Shimada

Appl. Phys. Lett. 72, 495 (1998); http://dx.doi.org/10.1063/1.120767 (3 pages) | Cited 7 times

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The superlattices Fe/Si exhibit an antiferromagnetic coupling for very thin Si layers and giant magnetoresistance (GMR) is observed accompanying this coupling. The GMR for these superlattices measured with a current in the plane of the sample (CIP-GMR) is usually less than 0.2%. Considering a shunt effect due to large resistivity of Si layers, we measured the GMR with a current perpendicular to the sample plane (CPP-GMR). The thickness and width of the electrodes for the CPP measurement were carefully designed so that the current is always homogeneous in the sample. As a result, CPP-GMR for these superlattices is found to be about 3–6 times larger than CIP-GMR. Although a careful design of the electrodes is needed for homogeneity of the current, the technique is much easier than the CPP measurement for metal/metal superlattices and expected to provide valuable information on the spin-dependent electron transport phenomena in the Fe/Si superlattices. © 1998 American Institute of Physics.
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75.47.De Giant magnetoresistance
73.40.Ns Metal-nonmetal contacts
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
72.15.Gd Galvanomagnetic and other magnetotransport effects
75.50.Bb Fe and its alloys
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