APL Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

26 Oct 1998

Volume 73, Issue 17, pp. 2393-2529

Return to All Sections
back to top
RSS Feeds

Atomically defined epitaxy and physical properties of strained La0.6Sr0.4MnO3 films

M. Izumi, Y. Konishi, T. Nishihara, S. Hayashi, M. Shinohara, M. Kawasaki, and Y. Tokura

Appl. Phys. Lett. 73, 2497 (1998); http://dx.doi.org/10.1063/1.122494 (3 pages) | Cited 76 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
La0.6Sr0.4MnO3 thin films were fabricated on SrTiO3 (001) substrates using pulsed laser deposition with observing persistent intensity oscillation of reflection high-energy electron diffraction. By atomic force microscopy, the surface of resulting films was confirmed to be extremely flat, showing atomically smooth terraces and 0.4 nm high steps corresponding to a unit cell height of perovskite. The surface terminating atomic layer was unambiguously assigned to the MnO2 layer by coaxial impact collision ion scattering spectroscopy. Crystal symmetry of the films is distorted into a tetragonal one due to the strain to fulfill perfect in-plane matching with the substrate even for films as thick as 100 nm. Even for films as thin as 4 nm (10 unit cells), ferromagnetic transition takes place to induce a metallic state and large negative magnetoresistance is observed as well. © 1998 American Institute of Physics.
Show PACS
68.55.-a Thin film structure and morphology
81.05.Je Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides)
81.15.Fg Pulsed laser ablation deposition
81.15.Kk Vapor phase epitaxy; growth from vapor phase
73.61.At Metal and metallic alloys
68.35.B- Structure of clean surfaces (and surface reconstruction)
79.20.Rf Atomic, molecular, and ion beam impact and interactions with surfaces
75.50.Cc Other ferromagnetic metals and alloys
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.70.Ak Magnetic properties of monolayers and thin films
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
72.60.+g Mixed conductivity and conductivity transitions

On the synthesis and magnetic properties of Nd(Fe,Mo,Ti)12

Q. M. Cheng, J. H. Lin, and M. Z. Su

Appl. Phys. Lett. 73, 2500 (1998); http://dx.doi.org/10.1063/1.122495 (3 pages) | Cited 1 time

Full Text: Read Online (HTML) | Download PDF

Show Abstract
NdFe10+xMo2−2xTix and NdFe10+xMo2−x (0 ⩽ x ⩽ 1.0) have been synthesized by using a reduction-diffusion process with superfine precursor particles as starting materials. The easy direction of magnetization of the NdFe10+xMo2−2xTix system has been determined by ac susceptibility and x-ray diffraction of the aligned samples. By comparison with NdFe12+xMo2−x, a magnetic phase diagram of the NdFe10+xMo2−2xTix system has been proposed. © 1998 American Institute of Physics.
Show PACS
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.30.Cr Saturation moments and magnetic susceptibilities
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
61.66.Dk Alloys
81.05.Bx Metals, semimetals, and alloys
75.40.-s Critical-point effects, specific heats, short-range order

Easy axis distribution in interacting fine-particle systems

R. Iglesias, H. Rubio, and S. Suárez

Appl. Phys. Lett. 73, 2503 (1998); http://dx.doi.org/10.1063/1.122496 (3 pages) | Cited 6 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A general method applicable to interacting fine-particle systems in the mean-field approximation is developed. When the external applied field is decreased, interaction and disorder give rise to a rotation of the integration domain that must be considered for the determination of the average values. This model provides useful expressions for obtaining the magnetic easy axis distribution, and reproducing the results of the preceding noninteracting theories when interaction between particles is not taken into account. © 1998 American Institute of Physics.
Show PACS
75.50.Tt Fine-particle systems; nanocrystalline materials
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.30.Gw Magnetic anisotropy

Tunneling-like magnetoresistance in bicrystal La0.8Sr0.2MnO3−δ thin films

K. Steenbeck, T. Eick, K. Kirsch, H.-G. Schmidt, and E. Steinbeiß

Appl. Phys. Lett. 73, 2506 (1998); http://dx.doi.org/10.1063/1.122497 (3 pages) | Cited 51 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Epitaxial ferromagnetic La0.8Sr0.2MnO3−δ films have been sputtered on SrTiO3 bicrystal substrates. Etched patterns crossing the bicrystal grain boundary are compared with identical patterns not crossing it. The films were annealed at different conditions and their magnetoresistance measured as a function of temperature T and of in plane magnetic field H strength and direction. Annealing at 900 °C was found to modify the grain boundary and to increase its magnetoresistance. For H = ±80 Oe parallel to the grain boundary and T = 32 K narrow magnetoresistance peaks of 60% height are measured. They are interpreted in the frame of an in plane magnetotunneling structure. © 1998 American Institute of Physics.
Show PACS
75.47.De Giant magnetoresistance
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
73.61.At Metal and metallic alloys
75.50.Dd Nonmetallic ferromagnetic materials
72.15.Gd Galvanomagnetic and other magnetotransport effects
73.40.Gk Tunneling
68.55.Ln Defects and impurities: doping, implantation, distribution, concentration, etc.
61.72.Mm Grain and twin boundaries
75.60.Nt Magnetic annealing and temperature-hysteresis effects

Forced magnetostriction in FeZr-based amorphous alloys

J. Arcas, A. Hernando, J. M Barandiarán, M. Schwetz, and R. Grössinger

Appl. Phys. Lett. 73, 2509 (1998); http://dx.doi.org/10.1063/1.122498 (3 pages) | Cited 4 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The magnetostriction constant and forced volume expansion have been measured in amorphous melt–spun ribbons of composition Fe88Zr7B4Cu1, Fe87.2Zr7.4B4.3Cu1.1, Fe86Zr7B6Cu1, and Fe85Zr7B6Cu2. The values obtained show that the volume expansion plays the most important role at room temperature. The magnetic character of these samples was also estimated from the Arrott plots at room temperature and from the thermal dependence of the magnetization. As has been found, the volume contribution decreases with the Curie temperature, whereas the saturation magnetostriction contribution increases. The results measured are also related with the previously reported stress dependence of the Curie temperature. © 1998 American Institute of Physics.
Show PACS
75.50.Kj Amorphous and quasicrystalline magnetic materials
75.50.Bb Fe and its alloys
75.80.+q Magnetomechanical effects, magnetostriction
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
81.05.Kf Glasses (including metallic glasses)

Site occupancy of Zr in Nd(FeZr)B magnet during hydrogenation disproportionation desorption recombination process

A. Ashfaq, M. Matsuura, and M. Sakurai

Appl. Phys. Lett. 73, 2512 (1998); http://dx.doi.org/10.1063/1.122499 (3 pages) | Cited 7 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
In order to elucidate the role of Zr addition for the evolution of magnetic anisotropy in hydrogenation disproportionation desorption recombination treated NdFeB magnets, Zr site occupancy in Nd16Fe75.5Zr0.5B8 alloy has been investigated by means of x-ray absorption fine structure. Zr is found to occupy preferably the Fe(j2) sites in the Nd2Fe14B structure for the as-cast state and keeps this position in the disproportionated stage. Zr(j2) sites are situated at the position connecting two Fe-hexagonal nets where strong Fe–Zr bondings stabilize Nd2Fe14B structure against disproportionation. © 1998 American Institute of Physics.
Show PACS
75.50.Ww Permanent magnets
75.50.Bb Fe and its alloys
75.30.Gw Magnetic anisotropy
68.03.Fg Evaporation and condensation of liquids
68.43.Mn Adsorption kinetics
61.05.cj X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc.
78.70.Dm X-ray absorption spectra
61.50.Lt Crystal binding; cohesive energy
75.50.Vv High coercivity materials
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close