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

9 Oct 2006

Volume 89, Issue 15, Articles (15xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 89, 151920 (2006); http://dx.doi.org/10.1063/1.2360906 (3 pages)

Aycan Yurtsever, Matthew Weyland, and David A. Muller
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Controlled magnetic anisotropy of SrRuO3 thin films grown on nominally exact SrTiO3(001) substrates

G. Herranz, F. Sánchez, N. Dix, D. Hrabovsky, I. C. Infante, J. Fontcuberta, M. V. García-Cuenca, C. Ferrater, and M. Varela

Appl. Phys. Lett. 89, 152501 (2006); http://dx.doi.org/10.1063/1.2359296 (3 pages) | Cited 5 times

Online Publication Date: 9 October 2006

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Ferromagnetic SrRuO3 films with controlled in-plane magnetic anisotropy have been deposited on nominally exact (miscut <0.1°) SrTiO3(001) substrates. Films grown on as-received substrates display in-plane uniaxial magnetic anisotropy whereas films grown on treated TiO2-terminated surfaces are magnetically biaxial. It is found that the in-plane magnetic anisotropy is intimately linked to the in-plane crystallographic texture: whereas the former films are single domain, the latter are twinned. The authors show that the different textures are determined by the growth mechanisms, step flow or layer by layer, which in turn are critically determined by the substrate surface conditions.
Show PACS
75.70.Ak Magnetic properties of monolayers and thin films
75.50.Dd Nonmetallic ferromagnetic materials
75.30.Gw Magnetic anisotropy
68.55.-a Thin film structure and morphology
75.60.Ch Domain walls and domain structure
68.55.A- Nucleation and growth

Out-of-plane exchange bias in [Pt/Co]–IrMn bilayers sputtered on prepatterned nanostructures

A. Bollero, V. Baltz, B. Rodmacq, B. Dieny, S. Landis, and J. Sort

Appl. Phys. Lett. 89, 152502 (2006); http://dx.doi.org/10.1063/1.2359429 (3 pages) | Cited 6 times

Online Publication Date: 9 October 2006

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Exchange bias effects along the out-of-plane direction have been investigated in arrays of 100 nm nanostructures prepared on top of prepatterned substrates, consisting of a ferromagnetic [Pt/Co] multilayer with out-of-plane anisotropy exchange coupled to an antiferromagnetic IrMn layer. A significant loop shift is observed in these nanostructures (dots and trenches). The relative evolutions of the bias fields with the IrMn thickness in the nanostructures and in the continuous film are ascribed to both the effects of the IrMn domain size and thermal activation. Lower coordinated spins in the trenches and at the dot edges are assumed to play a key role on the bias properties. A reduction of the blocking temperature is observed for both the dots and the trenches with respect to the continuous film.
Show PACS
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.50.Cc Other ferromagnetic metals and alloys
81.15.Cd Deposition by sputtering
75.50.Tt Fine-particle systems; nanocrystalline materials
75.30.Gw Magnetic anisotropy

Superconductivity in metal-mixed ion-implanted polymer films

A. P. Micolich, E. Tavenner, B. J. Powell, A. R. Hamilton, M. T. Curry, R. E. Giedd, and P. Meredith

Appl. Phys. Lett. 89, 152503 (2006); http://dx.doi.org/10.1063/1.2358190 (3 pages) | Cited 5 times

Online Publication Date: 10 October 2006

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Ion implantation of normally insulating polymers offers an alternative to depositing conjugated organics onto plastic films to make electronic circuits. We used a 50 keV nitrogen ion beam to mix a thin 10 nm Sn/Sb alloy film into the subsurface of polyetheretherketone and report the low temperature properties of this material. We observed metallic behavior, and the onset of superconductivity below 3 K. There are strong indications that the superconductivity does not result from a residual thin film of alloy, but instead from a network of alloy grains coupled via a weakly conducting, ion-beam carbonized polymer matrix.
Show PACS
74.70.Kn Organic superconductors
74.62.Bf Effects of material synthesis, crystal structure, and chemical composition
74.78.-w Superconducting films and low-dimensional structures
74.25.F- Transport properties
61.80.Jh Ion radiation effects
64.75.-g Phase equilibria

Thermal characterization of submicron polyacrylonitrile fibers based on optical heating and electrical thermal sensing

Jinbo Hou, Xinwei Wang, and Lijun Zhang

Appl. Phys. Lett. 89, 152504 (2006); http://dx.doi.org/10.1063/1.2358952 (3 pages) | Cited 5 times

Online Publication Date: 10 October 2006

Full Text: Read Online (HTML) | Download PDF

Show Abstract
In this work, the thermal diffusivity of single submicron ( ∼ 800 nm) polyacrylonitrile (PAN) fibers is characterized using the recently developed optical heating and electrical thermal sensing technique. In the experiment, a thin Au film (approximately in the nanometer range) is coated on the surface of nonconductive PAN fibers. A periodically modulated laser beam is used to irradiate suspended individual fibers to achieve noncontact periodical heating. The periodical temperature response of the sample is monitored by measuring the electrical resistance variation of the thin Au coating. The experimental results for three different synthesized PAN fibers with varying Au coating thickness are presented and discussed.
Show PACS
66.30.Xj Thermal diffusivity
66.70.-f Nonelectronic thermal conduction and heat-pulse propagation in solids; thermal waves
78.20.N- Thermo-optic effects
78.20.nb Photothermal effects
72.20.Pa Thermoelectric and thermomagnetic effects
61.80.Ba Ultraviolet, visible, and infrared radiation effects (including laser radiation)
73.61.At Metal and metallic alloys

Improved properties of epitaxial YNixMn1−xO3 films by annealing under high magnetic fields

Yanwei Ma, Aixia Xu, Xiaohang Li, Xianping Zhang, M. Guilloux-Viry, O. Peña, S. Awaji, and K. Watanabe

Appl. Phys. Lett. 89, 152505 (2006); http://dx.doi.org/10.1063/1.2359290 (3 pages) | Cited 1 time

Online Publication Date: 10 October 2006

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The effect of annealing under a magnetic field on the microstructure and properties of YNixMn1−xO3 (x = 0.33 and 0.5) films has been investigated. It is found that the ferromagnetic transition temperature is significantly enhanced after postannealing in the presence of an 8 T magnetic field. Characterization study shows that the microstructure is affected, obtaining larger grains of uniform size when films are annealed under a magnetic field. The improvement in the ordering temperature of all films is interpreted in terms of the grain growth caused by the magnetic field driving force for boundary motion where the exchange coupling is high.
Show PACS
75.70.Ak Magnetic properties of monolayers and thin films
75.50.Dd Nonmetallic ferromagnetic materials
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
75.60.Nt Magnetic annealing and temperature-hysteresis effects
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.30.Et Exchange and superexchange interactions

Ferromagnetism in Ge1−xCrxTe epilayers grown by molecular beam epitaxy

Y. Fukuma, H. Asada, T. Taya, T. Irisa, and T. Koyanagi

Appl. Phys. Lett. 89, 152506 (2006); http://dx.doi.org/10.1063/1.2360903 (3 pages) | Cited 8 times

Online Publication Date: 11 October 2006

Full Text: Read Online (HTML) | Download PDF

Show Abstract
IV-VI ferromagnetic semiconductor Ge1−xCrxTe has been grown on BaF2 (111) by molecular beam epitaxy. The ferromagnetism was clearly established by direct magnetization and Hall measurements. The experimental correlation between the anomalous Hall resistivity ρxy and the resistivity ρxx, ρxy∝ρxx1.76, is understood from the semiclassical nature of the charge carrier dynamics, suggesting that the ferromagnetism gives rise to p-d exchange interaction. The Curie temperature increases systematically from the substrate temperature TS of 300 to 250 to 200 °C and with increasing the Cr composition along with each TS.
Show PACS
75.50.Pp Magnetic semiconductors
75.50.Dd Nonmetallic ferromagnetic materials
75.70.Ak Magnetic properties of monolayers and thin films
68.55.A- Nucleation and growth
81.15.Hi Molecular, atomic, ion, and chemical beam epitaxy
73.61.Le Other inorganic semiconductors

Enhanced pinning and proliferation of matching effects in a superconducting film with a Penrose array of magnetic dots

A. V. Silhanek, W. Gillijns, V. V. Moshchalkov, B. Y. Zhu, J. Moonens, and L. H. A. Leunissen

Appl. Phys. Lett. 89, 152507 (2006); http://dx.doi.org/10.1063/1.2361172 (3 pages) | Cited 10 times

Online Publication Date: 11 October 2006

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The vortex dynamics in superconducting films deposited on top of a fivefold Penrose array of magnetic dots is studied by means of transport measurements. The authors show that in the low pinning regime (demagnetized dots) a few periodic and aperiodic matching features coexist. In the strong pinning regime (magnetized dots) a richer structure of unforeseen periodic and aperiodic vortex patterns appear, giving rise to a clear enhancement of the critical current in a broader field range. Possible stable vortex configurations are determined by molecular dynamics simulations.
Show PACS
74.25.Uv Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses)
74.25.F- Transport properties
74.25.Sv Critical currents
74.78.-w Superconducting films and low-dimensional structures

Millimeter-wave magnetoelectric effects in bilayers of barium hexaferrite and lead zirconate titanate

G. Srinivasan, I. V. Zavislyak, and A. S. Tatarenko

Appl. Phys. Lett. 89, 152508 (2006); http://dx.doi.org/10.1063/1.2360901 (3 pages) | Cited 22 times

Online Publication Date: 12 October 2006

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Millimeter-wave magnetoelectric interactions have been studied through electric field effects on magnetic excitations in bilayers of single crystal barium ferrite and lead zirconate titanate (PZT). An electric field E produces a mechanical deformation in PZT, resulting in a shift δf in the frequency for electromagnetic modes in the ferrite. Reflected power versus frequency profiles at 40–55 GHz for a series of bias magnetic field and E = 0–10 kV/cm along the c axis of the ferrite showed an increase in δf to a maximum of 8 MHz. Theoretical estimates of δf are in agreement with the data.
Show PACS
75.80.+q Magnetomechanical effects, magnetostriction
77.65.-j Piezoelectricity and electromechanical effects
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
81.40.Lm Deformation, plasticity, and creep
62.20.F- Deformation and plasticity
75.50.Gg Ferrimagnetics

Composite free layer for high density magnetic random access memory with lower spin transfer current

Hao Meng and Jian-Ping Wang

Appl. Phys. Lett. 89, 152509 (2006); http://dx.doi.org/10.1063/1.2361280 (3 pages) | Cited 14 times

Online Publication Date: 12 October 2006

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A magnetic tunnel junction (MTJ) structure with a composite free layer consisting of a nanocurrent-channel (NCC) layer sandwiched by two CoFe layers was proposed and investigated. The NCC layer increased the local spin current density inside the free layer and thus enhanced the writing capability for MTJ devices. In comparison with the conventional MTJ design with a single free layer, the intrinsic critical switching current density was reduced from 2.4×107 to 8.5×106 A/cm2 by using the composite free layer. On the other hand, the thermal stability factor of the composite free layer, KuV/kBT, is around 149, which is almost the same as the value (159) for the MTJ device with a single free layer. The MTJ structure with the composite free layer is a candidate to solve the scaling problem for high density magnetic random access memory.
Show PACS
85.75.Dd Magnetic memory using magnetic tunnel junctions
85.70.Li Other magnetic recording and storage devices (including tapes, disks, and drums)
75.50.Ss Magnetic recording materials
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.50.Tt Fine-particle systems; nanocrystalline materials
75.60.-d Domain effects, magnetization curves, and hysteresis
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close