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30 Jul 2001

Volume 79, Issue 5, pp. 557-700

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Magnetic transitions and electrical transport in lanthanum strontium manganite: Effects of substitutions and high pressure

G. Srinivasan and D. Hanna

Appl. Phys. Lett. 79, 641 (2001); http://dx.doi.org/10.1063/1.1388872 (3 pages) | Cited 3 times

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The observation of a substitution-induced ferromagnetic order (Tc = 200 K) is reported in antiferromagnetic La0.9Sr0.1MnO3 (TN = 130 K) when 0.05 of La is replaced by yttrium. Important results of ferromagnetic resonance (FMR) and high-pressure transport studies are as follows. (i) Data on FMR linewidth and resistivity provide evidence for the presence of microscopic magnetic inhomogeneities, possibly La0.9Sr0.1MnO3. (ii) For zero external pressure, a resistivity peak at 130 K due to intergrain tunneling, a secondary peak close to Tc, and magnetoresistance (MR) on the order of 30% are observed. (iii) At high pressures, the resistivity peaks shift to higher temperatures at the rate of 24–26 K/GPa and MR values decrease. (iv) An internal pressure of 3 GPa due to Y substitution is inferred from high-pressure transport studies. © 2001 American Institute of Physics.
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75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.50.Dd Nonmetallic ferromagnetic materials
75.50.Ee Antiferromagnetics
72.20.My Galvanomagnetic and other magnetotransport effects
76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
72.20.Fr Low-field transport and mobility; piezoresistance
62.50.-p High-pressure effects in solids and liquids

Prediction of effective elements for magnetically induced phase separation in Co–Cr-based magnetic recording media

K. Oikawa, G. W. Qin, O. Kitakami, Y. Shimada, K. Fukamichi, and K. Ishida

Appl. Phys. Lett. 79, 644 (2001); http://dx.doi.org/10.1063/1.1389067 (3 pages) | Cited 13 times

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Thermodynamic calculations of the magnetically induced phase separation of the hcp phase in Co–Cr-based alloy systems, which is the origin of the compositional modulation observed in magnetic recording media, have been carried out. The magnetic and nonmagnetic terms in the Gibbs energy are evaluated from available thermodynamic data and Miedema’s semiempirical values. It is demonstrated that the phase separation in Co–Cr–X ternary alloys can be classified into four types, depending on the values of interaction energies between Co and/or Cr and X atoms. Existing magnetic data on Co–Cr-based recording media are discussed in terms of the phase stability of the hcp phases. The present calculations would be useful for development of high-density magnetic recording media. © 2001 American Institute of Physics.
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75.50.Ss Magnetic recording materials
81.30.Bx Phase diagrams of metals, alloys, and oxides
64.75.-g Phase equilibria
75.50.Cc Other ferromagnetic metals and alloys
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
65.40.G- Other thermodynamical quantities

Control of the colossal magnetoresistance by strain effect in Nd0.5Ca0.5MnO3 thin films

E. Rauwel Buzin, W. Prellier, Ch. Simon, S. Mercone, B. Mercey, B. Raveau, J. Sebek, and J. Hejtmanek

Appl. Phys. Lett. 79, 647 (2001); http://dx.doi.org/10.1063/1.1390313 (3 pages) | Cited 12 times

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Thin films of Nd0.5Ca0.5MnO3 manganites with colossal magnetoresistance (CMR) properties have been synthesized by the pulsed-laser deposition technique on (100)-(SrTiO3). The lattice parameters of these manganites and correlatively their CMR properties can be controlled by the substrate temperature TS. The maximum CMR effect at 50 K, calculated as the ratio ρ(H = 0T)/ρ(H = 7T) is 1011 for a deposition temperature of TS = 680 °C. Structural studies show that the Nd0.5Ca0.5MnO3 film is single phase, [010]-oriented and has a pseudocubic symmetry of the perovskite subcell with a = 3.77 Å at room temperature. We suggest that correlation between lattice parameters, CMR, and substrate temperature TS result mainly from substrate-induced strains which can weaken the charge-ordered state at low temperature. © 2001 American Institute of Physics.
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75.47.De Giant magnetoresistance
75.47.Gk Colossal magnetoresistance
68.55.-a Thin film structure and morphology
75.80.+q Magnetomechanical effects, magnetostriction
81.15.Fg Pulsed laser ablation deposition

Simultaneous measurements of the magnetostrictive coefficient, Young’s modulus, and Poisson ratio of thin films

Xuesong Jin, C. O. Kim, Y. P. Lee, Y. Zhou, and Huibin Xu

Appl. Phys. Lett. 79, 650 (2001); http://dx.doi.org/10.1063/1.1389511 (3 pages) | Cited 3 times

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A method, which determines simultaneously the magnetostrictive coefficient, Young’s modulus, and Poisson ratio of a thin film utilizing the minimization of the total elastic energy of a cantilever film–substrate system, is suggested. An inaccuracy for the magnetostrictive coefficient, caused by assuming the elastic properties of the film as those of the corresponding bulk material, could be avoided and only a single elastic isotropic substrate is employed in the present method. The experimental data of an Fe-based amorphous thin film were analyzed by using the model. The calculated dependence of the magnetostrictive coefficient on the external magnetic field was compared with the experiment, and the discrepancy between both results were explained. The elastic properties of the film were also obtained. © 2001 American Institute of Physics.
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75.70.Ak Magnetic properties of monolayers and thin films
62.20.D- Elasticity
81.40.Jj Elasticity and anelasticity, stress-strain relations
75.80.+q Magnetomechanical effects, magnetostriction
75.50.Kj Amorphous and quasicrystalline magnetic materials
75.50.Bb Fe and its alloys

Giant isotropic magnetostriction of itinerant-electron metamagnetic La(Fe0.88Si0.12)13Hy compounds

S. Fujieda, A. Fujita, K. Fukamichi, Y. Yamazaki, and Y. Iijima

Appl. Phys. Lett. 79, 653 (2001); http://dx.doi.org/10.1063/1.1388157 (3 pages) | Cited 59 times

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La(FexSi1−x)13 compounds exhibit an itinerant-electron metamagnetic (IEM) transition above Curie temperature TC. The IEM transition in the compound with x=0.88 is accompanied by a giant volume change. From a practical viewpoint, TC was controlled by hydrogen absorption in order to obtain such a giant volume magnetostriction at room temperature. For the La(Fe0.88Si0.12)13H1.0 compound, the IEM transition occurs above TC = 278 K, and a significant isotropic linear magnetostriction of about 0.3% at 7 T is induced in the vicinity of room temperature. This large magnetostriction is attributed to the giant volume magnetostriction of about 1% by the IEM transition. © 2001 American Institute of Physics.
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75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.80.+q Magnetomechanical effects, magnetostriction

Quantitative interpretation of magnetic force microscopy images from soft patterned elements

J. M. García, A. Thiaville, J. Miltat, K. J. Kirk, J. N. Chapman, and F. Alouges

Appl. Phys. Lett. 79, 656 (2001); http://dx.doi.org/10.1063/1.1389512 (3 pages) | Cited 31 times

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By combining a finite element tip model and numerical simulations of the tip–sample interaction, it is shown that magnetic force microscopy images of patterned soft elements may be quantitatively compared to experiments, even when performed at low lift heights, while preserving physically realistic tip characteristics. The analysis framework relies on variational principles. Assuming magnetically hard tips, the model is both exact and numerically more accurate than hitherto achieved. © 2001 American Institute of Physics.
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68.37.Rt Magnetic force microscopy (MFM)
75.70.-i Magnetic properties of thin films, surfaces, and interfaces
07.79.Pk Magnetic force microscopes
02.70.Dh Finite-element and Galerkin methods
75.50.Bb Fe and its alloys
75.25.-j Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)
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