Low field magnetoresistance of intergranular tunneling in field-aligned chromium dioxide powders
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 14, 2003
Grant Date -
N/A
app pub date -
Aug 21, 2001
filing date -
Aug 21, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The magnetic and magnetotransport properties of field-aligned single domain half-metallic CrO.sub.2 powders have been studied. Needle-shaped nanoparticles of CrO.sub.2 have been aligned in a strong magnetic field. The aligned powder sample shows a strong anisotropy along the alignment direction. The conduction mechanism of the aligned CrO.sub.2 powder sample has been examined and is consistent with the intergranular spin dependent tunneling. Negative tunneling magnetoresistance (TMR) of about 41% is achieved in a small field in the vicinity of the coercive field at 5 K. The magnetoresistance (MR) versus field curve shows two well-separated narrow peaks at the coercive fields and resembles that of a magnetic tunnel junction. This junction-like MR results from the narrow switching field distribution of the aligned powders. The results suggest that the aligned magnetic CrO.sub.2 particles may find novel applications in spin transport structures and devices.
First Claim
Family
International Classification(s)
- [Classification Symbol]
- [Patents Count]
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully