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22 Dec 2003

Volume 83, Issue 25, pp. 5121-5321

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Appl. Phys. Lett. 83, 5310 (2003); http://dx.doi.org/10.1063/1.1635070 (3 pages)

Z. G. Chiragwandi, O. Nur, M. Willander, and N. Calander
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Magnetic tunnel junctions with ZnSe barriers

Xin Jiang, Alex F. Panchula, and Stuart S. P. Parkin

Appl. Phys. Lett. 83, 5244 (2003); http://dx.doi.org/10.1063/1.1630160 (3 pages) | Cited 15 times

Online Publication Date: 17 December 2003

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Magnetic tunnel junctions with ZnSe barriers were fabricated with a combination of magnetron sputtering, ion beam sputtering, and effusion cell evaporation. Tunneling magnetoresistance values of ∼10% are observed at room temperature. The temperature and barrier thickness dependences of the junction resistance and tunneling magnetoresistance are consistent with a predominant direct tunneling mechanism when the barrier thickness is less than ∼10 nm thick. © 2003 American Institute of Physics.
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81.05.Dz II-VI semiconductors
81.15.Cd Deposition by sputtering
81.15.-z Methods of deposition of films and coatings; film growth and epitaxy
75.47.Pq Other materials
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
73.61.Ga II-VI semiconductors

Nanotubes of rare-earth manganese oxide

P. Levy, A. G. Leyva, H. E. Troiani, and R. D. Sánchez

Appl. Phys. Lett. 83, 5247 (2003); http://dx.doi.org/10.1063/1.1635663 (3 pages) | Cited 27 times

Online Publication Date: 17 December 2003

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We report the synthesis of rare-earth manganese-oxide-based nanotubes. The pore wetting technique was used to obtain structures of nominal composition La0.325Pr0.300Ca0.375MnO3 with 800 nm external diameter, 4000 nm length, and wall thickness below 100 nm exhibiting magnetic and magnetoresistive behavior below 200 K, including nonvolatile memory. Walls are found to be formed by small crystals of approximately 20 nm. Structures obtained using different diameter of pores, as small as 100 nm, have a similar aspect ratio. Results show the realization of nanotubes of manganites exhibiting intrinsic phase separation. © 2003 American Institute of Physics.
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61.46.-w Structure of nanoscale materials
81.07.De Nanotubes
75.47.Lx Magnetic oxides
75.75.-c Magnetic properties of nanostructures

The role of the cooperative Jahn–Teller effect in the charge-ordered La1−xCaxMnO3 (0.5 ⩽ x ⩽ 0.87) manganites

R. K. Zheng, G. Li, A. N. Tang, Y. Yang, W. Wang, X. G. Li, Z. D. Wang, and H. C. Ku

Appl. Phys. Lett. 83, 5250 (2003); http://dx.doi.org/10.1063/1.1635662 (3 pages) | Cited 20 times

Online Publication Date: 17 December 2003

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Based on the magnetoresistance, magnetization, ultrasound, and crystallographic data, we studied the role of the cooperative Jahn–Teller (JT) effect in the charge-ordered (CO) state for La1−xCaxMnO3. We found that, with increasing the fraction of Q3 mode of JT distortion and decreasing that of Q2 mode in the CO state, the magnetic structure evolves from charge-exchange-type to C-type and the orbital ordering changes from 3dx2−r2/3dy2−r2-type to 3dz2−r2-type, with the strength of ferromagnetism and the phase separation tendency being suppressed. At the same time, the stability of the CO state and the cooperative JT lattice distortion increase. These effects imply that the cooperative JT effect with different vibration modes is the key ingredient in understanding the essential physics of the CO state. © 2003 American Institute of Physics.
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71.45.-d Collective effects
75.50.Dd Nonmetallic ferromagnetic materials
71.70.Ej Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect
75.25.-j Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)

Disk substrate deposition techniques for monodisperse chemically synthesized FePt nanoparticle media

Hiroyoshi Kodama, Satoru Momose, Nobutaka Ihara, Takuya Uzumaki, and Atsushi Tanaka

Appl. Phys. Lett. 83, 5253 (2003); http://dx.doi.org/10.1063/1.1635980 (3 pages) | Cited 20 times

Online Publication Date: 17 December 2003

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Self-assembled FePt nanoparticles hold promise for future ultrahigh-density magnetic recording media because of their high anisotropy and capability to be formed into small and uniform grains. By using a special spin coater, we were able to form a dense array of FePt particles across the entire surface of a 2.5 in. disk substrate. Our method can control the number of layers of FePt nanoparticles. The media deposited with FePt nanoparticles by the spin coater was annealed in a vacuum. We measured read–write properties of the FePt nanoparticle media on a spin stand, and succeeded in detecting a signal of 290 kfci. © 2003 American Institute of Physics.
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75.50.Tt Fine-particle systems; nanocrystalline materials
75.50.Ss Magnetic recording materials
75.70.Ak Magnetic properties of monolayers and thin films
61.46.-w Structure of nanoscale materials
81.15.-z Methods of deposition of films and coatings; film growth and epitaxy
81.07.Wx Nanopowders
85.70.Li Other magnetic recording and storage devices (including tapes, disks, and drums)
75.30.Gw Magnetic anisotropy

Elliptic flux-line-cutting critical-state model

C. Romero-Salazar and F. Pérez-Rodríguez

Appl. Phys. Lett. 83, 5256 (2003); http://dx.doi.org/10.1063/1.1635667 (3 pages) | Cited 13 times

Online Publication Date: 17 December 2003

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An anisotropic model for describing the critical state of hard superconductors subjected to crossed and rotating magnetic fields is proposed. © 2003 American Institute of Physics.
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74.25.Uv Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses)
74.20.-z Theories and models of superconducting state
74.40.-n Fluctuation phenomena

Influence of interface alloying on the magnetic properties of Co/Pd multilayers

J. Carrey, A. E. Berkowitz, W. F. Egelhoff, and David J. Smith

Appl. Phys. Lett. 83, 5259 (2003); http://dx.doi.org/10.1063/1.1635660 (3 pages) | Cited 11 times

Online Publication Date: 17 December 2003

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The origin of perpendicular anisotropy in Co/Pd multilayers has been investigated. We examined this question by studying multilayers in which the total equivalent thicknesses of Co and Pd are kept constant, but in which the Co/Pd interface is progressively alloyed using codeposition of the two elements. The multilayers have the structure: [(0.3 nm Co codeposited with y nm Pd)/(2.0−y) nm Pd]15, with y = 0, 0.1, 0.3, 0.5, 1, 1.5, 2.0. X-ray diffraction confirms that the total thicknesses of the samples and their overall Co/Pd ratios stay constant. Magnetic properties are almost unaffected by alloying up to y = 0.5 nm, suggesting that the interface of the usual Co/Pd multilayer could be modeled by a mix of 0.3 nm of Co with 0.5 nm of Pd embedded between 2 monolayers of Pd. Using this model and reasonable assumptions about the strain and magnetostriction of a Co-Pd alloy, we show that the magnetoelastic effect yields a perpendicular anisotropy between 2.3×105 and 3.5×105 J/m3. The perpendicular anisotropy estimated in our samples (1.5×105 J/m3) can thus be satisfactorily explained. © 2003 American Institute of Physics.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
68.35.Fx Diffusion; interface formation
75.50.Ss Magnetic recording materials
75.80.+q Magnetomechanical effects, magnetostriction
75.30.Gw Magnetic anisotropy
75.50.Cc Other ferromagnetic metals and alloys
81.15.Cd Deposition by sputtering
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