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 Sep 1998

Volume 73, Issue 11, pp. 1457-1597

Return to All Sections
back to top
RSS Feeds

Microstructure refinement and improvements of magnetic properties of two-phase exchange-coupled Sm2Fe15Ga2Cx/α-Fe nanocomposites by additional Zr

Zhao-hua Cheng, H. Kronmüller, and Bao-gen Shen

Appl. Phys. Lett. 73, 1586 (1998); http://dx.doi.org/10.1063/1.122212 (3 pages) | Cited 15 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The effect of additive Zr on the microstructure and magnetic properties of nanocomposite Sm2Fe15Ga2Cx/α-Fe permanent magnet has been investigated. A few percent of Zr addition was found to improve significantly its magnetic properties. After an appropriate heat treatment, the remanence, intrinsic coercivity, and maximum energy product increase from 6.4 kG, 5.5 kOe, and 5.6 MGOe for the Zr-free sample to 7.2 kG, 7.7 kOe, and 9.0 MGOe for the Zr-containing one, respectively. The significant improvements of magnetic properties originate from the microstructure refinement by introducing Zr. The “exchange-spring” behavior and the exchange-coupling between the magnetically hard phase Sm2Fe15Ga2Cx and the soft one α-Fe are discussed as well. © 1998 American Institute of Physics.
Show PACS
75.50.Ww Permanent magnets
75.30.Et Exchange and superexchange interactions
75.50.Vv High coercivity materials
75.50.Kj Amorphous and quasicrystalline magnetic materials

Magnetotransport investigations of ultrafine single-crystalline bismuth nanowire arrays

Zhibo Zhang, Xiangzhong Sun, M. S. Dresselhaus, Jackie Y. Ying, and Joseph P. Heremans

Appl. Phys. Lett. 73, 1589 (1998); http://dx.doi.org/10.1063/1.122213 (3 pages) | Cited 94 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We have measured the magnetotransport properties of ultrafine single-crystalline Bi nanowire arrays embedded in a dielectric matrix. At low temperatures (T ⩽ 50 K), the wire boundary scattering is shown to be the dominant scattering process for carriers. A reversal in the temperature dependence of the magnetoresistance was observed for wires with 65 nm average diameter relative to those with 109 nm average diameter when T ⩽ 100 K. We attribute this difference to effects due to the quantization of the transverse momentum of the carriers, which results in a semimetal-semiconductor transition for Bi nanowires as the wire diameter becomes sufficiently small. © 1998 American Institute of Physics.
Show PACS
73.23.-b Electronic transport in mesoscopic systems
72.20.My Galvanomagnetic and other magnetotransport effects
73.21.-b Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close