Nanomagnetic systems show exotic memory effects in the dc magnetization as a function of temperature. We present magnetization measurements on systems of nanomagnetic particles that show that such systems store the memory of either decrease or increase of magnetic field enabling a magnetic "coding" of "0"s and "1"s. Application of a field larger than a critical field, H* erases the memory effects. We show that this behavior can be explained by a wide distribution of grain sizes having different blocking temperatures. The effect can be used as a tool for measuring spacial and temporal magnetization changes of a magnetic surface.
|Number of pages||3|
|Journal||Applied Physics Letters|
|State||Published - 2006|
Bibliographical noteFunding Information:
The authors gratefully acknowledge useful discussions with S. Sen. This research was supported by the Israel Science Foundation (Grant No. 249/05).