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

14 Apr 2003

Volume 82, Issue 15, pp. 2371-2540

Issue Cover Spotlight Figure

Appl. Phys. Lett. 82, 2491 (2003); http://dx.doi.org/10.1063/1.1566791 (3 pages)

Jun Li, Qi Ye, Alan Cassell, Hou Tee Ng, Ramsey Stevens, Jie Han, and M. Meyyappan
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Spin engineering of CoPd alloy films via the inverse piezoelectric effect

Jeong-Won Lee, Sung-Chul Shin, and Sang-Koog Kim

Appl. Phys. Lett. 82, 2458 (2003); http://dx.doi.org/10.1063/1.1566795 (3 pages) | Cited 19 times

Online Publication Date: 7 April 2003

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The spin engineering of CoxPd1−x alloy films on Pb(Zr0.52Ti0.48)O3 substrates was studied by measuring the polar Kerr rotation hysteresis loops and their electric field dependencies. The electric field dependence of polar Kerr rotation strongly depends on the composition of the CoPd alloys. This is especially so in the case of Co0.25Pd0.75 alloy film where the hysteresis loop of magnetic remanence with respect to voltage applied is nearly squared, i.e., the direction of magnetization maintains its initial state even when the voltage applied is turned off. This spin engineering in a ferromagnetic/piezoelectric hybrid system is possible mainly due to a combination of the magnetostrictive effect and the inverse piezoelectric effect. The results are applicable to future nonvolatile memory devices. © 2003 American Institute of Physics.
Show PACS
75.70.Ak Magnetic properties of monolayers and thin films
75.50.Cc Other ferromagnetic metals and alloys
77.65.-j Piezoelectricity and electromechanical effects
75.80.+q Magnetomechanical effects, magnetostriction
78.20.Ls Magneto-optical effects
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.47.Np Metals and alloys
85.75.-d Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields

L10 ordering of off-stoichiometric FePt (001) thin films at reduced temperature

T. Seki, T. Shima, K. Takanashi, Y. Takahashi, E. Matsubara, and K. Hono

Appl. Phys. Lett. 82, 2461 (2003); http://dx.doi.org/10.1063/1.1567053 (3 pages) | Cited 48 times

Online Publication Date: 7 April 2003

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We have investigated the effect of extensive compositional change on the structure and magnetic properties of FePt sputtered films deposited at a substrate temperature of 300 °C. The Fe concentration in the FePt films was varied from 19 to 68 at. %. In the x-ray diffraction patterns, (001) and (003) superlattice peaks were observed at a Pt-rich composition range, indicating the formation of a L10 ordered structure. A L10 ordered Fe38Pt62 film exhibited perpendicular magnetization with a large uniaxial magnetic anisotropy of Ku = 1.8×107 erg/cm3. © 2003 American Institute of Physics.
Show PACS
75.70.Ak Magnetic properties of monolayers and thin films
68.55.-a Thin film structure and morphology
75.50.Bb Fe and its alloys
75.50.Ss Magnetic recording materials
81.15.Cd Deposition by sputtering
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.30.Gw Magnetic anisotropy

Parametrically driven first-order Suhl instability and nonlinearities in bismuth-substituted yttrium iron garnet films

A. Y. Elezzabi and S. E. Irvine

Appl. Phys. Lett. 82, 2464 (2003); http://dx.doi.org/10.1063/1.1567047 (3 pages) | Cited 2 times

Online Publication Date: 7 April 2003

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We have demonstrated the enhancement of spin-wave nonlinearities in a bismuth-substituted yttrium iron garnet (Bi-YIG) film by parametrically exciting the first-order Suhl instability at the difference frequency of two simultaneous driving frequencies. The results show that parametric excitation of spin waves can cause this instability to grow at low threshold powers, which, in turn, channels power to other nonlinear spin-wave modes. Multiple interactions between spin waves lead to the enhancement of nonlinear processes. © 2003 American Institute of Physics.
Show PACS
75.30.Ds Spin waves
75.50.Gg Ferrimagnetics
42.65.Ky Frequency conversion; harmonic generation, including higher-order harmonic generation
75.70.Ak Magnetic properties of monolayers and thin films
78.66.Nk Insulators
78.20.Ls Magneto-optical effects

Effects of interlayer electrode thickness in Nb/(MoSi2/Nb)N stacked Josephson junctions

Yonuk Chong, P. D. Dresselhaus, S. P. Benz, and J. E. Bonevich

Appl. Phys. Lett. 82, 2467 (2003); http://dx.doi.org/10.1063/1.1566797 (3 pages) | Cited 25 times

Online Publication Date: 7 April 2003

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Dense, vertically stacked Josephson junction arrays are being developed for voltage metrology applications. We present measurements of the uniformity and reproducibility of Nb/(MoSi2/Nb)N vertically stacked junctions that clarify the superconducting properties of the middle Nb superconducting electrode. Middle electrode thicknesses down to 20 nm have shown minimal suppression of the superconducting order parameter as measured through the critical current density. Even with a middle electrode thickness of 5 nm, excellent junction uniformity has been observed as demonstrated by the measurement of large Shapiro steps when the arrays are biased with microwaves. We also discuss the role of the superconducting coherence length in these arrays of high-density junctions.
Show PACS
74.50.+r Tunneling phenomena; Josephson effects
74.81.Fa Josephson junction arrays and wire networks
74.25.Sv Critical currents
74.45.+c Proximity effects; Andreev reflection; SN and SNS junctions
74.25.Ha Magnetic properties including vortex structures and related phenomena

Switching field phase diagram of Co nanoring magnets

Y. G. Yoo, M. Kläui, C. A. F. Vaz, L. J. Heyderman, and J. A. C. Bland

Appl. Phys. Lett. 82, 2470 (2003); http://dx.doi.org/10.1063/1.1568167 (3 pages) | Cited 73 times

Online Publication Date: 7 April 2003

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We have studied the magnetic switching behavior of arrays of Co ring elements as a function of film thickness (2 ⩽ t ⩽ 32 nm), ring width (0.15 ⩽ w ⩽ 0.7 μm), and external diameter (0.5 ⩽ D ⩽ 2.0 μm), using magneto-optical Kerr effect magnetometry. For thick rings, two stable magnetic states are observed, a high remanence state (called the “onion” state) and a low remanence state (called the vortex state). The switching field for the transition from the onion to the vortex state increases with increasing thickness t and external diameter D, and with decreasing width w. In particular, for thin rings, the switching occurs between the two oppositely magnetized onion states, i.e., no vortex states develop during the reversal process. The transition between these two regimes depends on the diameter and width of the rings, and phase diagrams for the dependence of the switching behavior on the geometric parameters are presented. The switching behavior is discussed in terms of the competition between the exchange and magnetostatic energy terms. © 2003 American Institute of Physics.
Show PACS
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.50.Tt Fine-particle systems; nanocrystalline materials
75.70.Ak Magnetic properties of monolayers and thin films
78.67.Bf Nanocrystals, nanoparticles, and nanoclusters
81.07.Bc Nanocrystalline materials
75.50.Cc Other ferromagnetic metals and alloys
75.30.Ds Spin waves
75.30.Et Exchange and superexchange interactions
75.60.Jk Magnetization reversal mechanisms
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
78.20.Ls Magneto-optical effects
78.66.Bz Metals and metallic alloys

Tilted media in a perpendicular recording system for high areal density recording

Y. Y. Zou, J. P. Wang, C. H. Hee, and T. C. Chong

Appl. Phys. Lett. 82, 2473 (2003); http://dx.doi.org/10.1063/1.1565503 (3 pages) | Cited 34 times

Online Publication Date: 7 April 2003

Full Text: Read Online (HTML) | Download PDF

Show Abstract
To overcome the high sensitivity of the signal-to-noise ratio (SNR) to the switching field distribution in the perpendicular media, we proposed to use tilted media in the perpendicular recording system in this letter. It was found that a much better tolerance of the easy-axis distribution could be achieved when tilted media were used instead of perpendicular media in a perpendicular recording system. We then analyzed the range of the switching field at the freezing points, and found that high Ku magnetic material is feasible in tilted media. The results indicated that the areal density could be more than 62% higher than that of perpendicular media when 45° easy-axis tilted media with Ku = 7.0×106 erg/cm3 were used. Finally, simulation of the switching dynamics revealed that a much faster magnetization switching could be achieved in 45°-tilted media than in perpendicular media. © 2003 American Institute of Physics.
Show PACS
75.50.Ss Magnetic recording materials
85.70.Kh Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.); domain-motion devices, etc.
75.30.Gw Magnetic anisotropy
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close