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

17 Feb 2003

Volume 82, Issue 7, pp. 1003-1136

Issue Cover Spotlight Figure

Appl. Phys. Lett. 82, 1069 (2003); http://dx.doi.org/10.1063/1.1544428 (3 pages)

M. L. Povinelli, Steven G. Johnson, J. D. Joannopoulos, and J. B. Pendry
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Toward photonic-crystal metamaterials: Creating magnetic emitters in photonic crystals

M. L. Povinelli, Steven G. Johnson, J. D. Joannopoulos, and J. B. Pendry

Appl. Phys. Lett. 82, 1069 (2003); http://dx.doi.org/10.1063/1.1544428 (3 pages) | Cited 26 times

Online Publication Date: 10 February 2003

Full Text: Read Online (HTML) | Download PDF

Show Abstract
In this work, we explore the possibility of designing photonic crystals to act as magnetic metamaterials: structures that exhibit magnetic properties despite the nonmagnetic character of their constituents. The building blocks of a magnetic material are microscopic magnetic dipoles, and to create a synthetic analog we employ point-defect modes in a photonic crystal. We begin by identifying a point defect mode in a three-dimensional crystal whose local field pattern resembles an oscillating magnetic moment. By analyzing the far-field pattern of the field radiated from the defect, we prove quantitatively that such modes can be designed with a primarily magnetic character: over 98% of the emitted power goes into magnetic multipole radiation. Unlike the constituents of natural para- and ferromagnetic materials, these synthetic magnetic emitters can be designed to operate without losses even at optical frequencies. © 2003 American Institute of Physics.
Show PACS
75.90.+w Other topics in magnetic properties and materials (restricted to new topics in section 75)
42.70.Qs Photonic bandgap materials
61.72.J- Point defects and defect clusters

Magnetism and interface properties of epitaxial Fe films on high-mobility GaAs/Al0.35Ga0.65As(001) two-dimensional electron gas heterostructures

B. Roldan Cuenya, M. Doi, W. Keune, S. Hoch, D. Reuter, A. Wieck, T. Schmitte, and H. Zabel

Appl. Phys. Lett. 82, 1072 (2003); http://dx.doi.org/10.1063/1.1542934 (3 pages) | Cited 12 times

Online Publication Date: 10 February 2003

Full Text: Read Online (HTML) | Download PDF

Show Abstract
An optimized heterostructure design and an optimized surface sputter-cleaning procedure allow the growth of high-quality epitaxial Fe(001) thin films at Ts< ∼ 50 °C on selectively doped GaAs/Al0.35Ga0.65As heterostructures, while retaining the high quality transport property of the two-dimensional electron gas. Magneto-optic Kerr effect measurements and model calculations indicate a dominant uniaxial in-plane anisotropy (easy axis along [110], hard axis along [1−10]) and small coercivity (∼15 Oe). Interface sensitive 57Fe Mössbauer measurements prove the absence of both magnetic “dead layers” and “half-magnetization” phases (compared to pure Fe), and provide evidence for intermixing within a few monolayers, retaining, however, a metallic Fe state and high Fe magnetic moments at the interface. © 2003 American Institute of Physics.
Show PACS
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.50.Bb Fe and its alloys
75.30.Gw Magnetic anisotropy
78.20.Ls Magneto-optical effects
81.65.Cf Surface cleaning, etching, patterning
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
76.80.+y Mössbauer effect; other γ-ray spectroscopy
75.30.Cr Saturation moments and magnetic susceptibilities
78.66.Bz Metals and metallic alloys

Thermal effects and in-plane magnetic anisotropy in thin-film recording media

Antony Ajan, E. N. Abarra, B. R. Acharya, A. Inomata, I. Okamoto, and M. Shinohara

Appl. Phys. Lett. 82, 1075 (2003); http://dx.doi.org/10.1063/1.1541095 (3 pages) | Cited 3 times

Online Publication Date: 10 February 2003

Full Text: Read Online (HTML) | Download PDF


See Also: Publisher's Note

Show Abstract
The effect of thermal activation on the in-plane magnetic anisotropy [measured as orientation ratio (OR)] of granular longitudinal magnetic recording media is investigated. Temperature and time dependent studies were made on media with different magnetic layer thicknesses. We find that OR is independent of temperature for a stable medium but shows a large increase with temperature for thermally unstable media. At low temperatures and high field sweep rates, the OR values are found to be the same, independent of the magnetic layer thickness. The unique value when thermal activation is reduced is consistent with the high population of the cobalt c axes along the texturing direction as the origin of anisotropy. © 2003 American Institute of Physics.
Show PACS
75.70.Ak Magnetic properties of monolayers and thin films
75.50.Ss Magnetic recording materials
75.30.Gw Magnetic anisotropy
85.70.Kh Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.); domain-motion devices, etc.
68.55.-a Thin film structure and morphology
81.15.Cd Deposition by sputtering
81.05.Bx Metals, semimetals, and alloys
75.50.Cc Other ferromagnetic metals and alloys

Development of a niobium nanosuperconducting quantum interference device for the detection of small spin populations

S. K. H. Lam and D. L. Tilbrook

Appl. Phys. Lett. 82, 1078 (2003); http://dx.doi.org/10.1063/1.1554770 (3 pages) | Cited 50 times

Online Publication Date: 10 February 2003

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Electron-beam lithography and reactive ion etching have been used to fabricate thin-film Au/Nb bridges with widths ∼ 50 nm. The Au layer was used as both a mask for etching the Nb superconducting bridge and as a resistive shunt in the completed devices. Using these junctions, a dc superconducting quantum interference device (SQUID) design with a hole size of 200 nm×200 nm (nano-SQUID) has also been fabricated and characterized. A flux noise of approximately 7×10−6 Φ0/Hz1/2 at 4.2 K has been achieved, from which a calculated spin sensitivity of 250 spin/Hz1/2 is predicted. © 2003 American Institute of Physics.
Show PACS
85.25.Dq Superconducting quantum interference devices (SQUIDs)
74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.)

Imaging of vortex configurations in thin films by scanning-tunneling microscopy

G. J. C. van Baarle, A. M. Troianovski, T. Nishizaki, P. H. Kes, and J. Aarts

Appl. Phys. Lett. 82, 1081 (2003); http://dx.doi.org/10.1063/1.1554481 (3 pages) | Cited 8 times

Online Publication Date: 10 February 2003

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report on imaging of vortices in thin superconducting films using surface passivation with an ultrathin Au layer. This allows investigation of surfaces that oxidize easily, as well as the mounting of samples in air. We studied vortex configurations in a material with weak vortex pinning (a-Mo2.7Ge) and a strongly pinning material (NbN) at 4.2 K in magnetic fields up to 1.4 T. In a-Mo2.7Ge, we observe a well-ordered hexagonal lattice, with local defects beginning to appear around 1.0 T. In NbN, the vortex lattice is fully disordered. © 2003 American Institute of Physics.
Show PACS
74.78.-w Superconducting films and low-dimensional structures
74.25.Uv Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses)
68.37.Ef Scanning tunneling microscopy (including chemistry induced with STM)
74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.)
81.65.Rv Passivation
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close