Record Details

Temperature dependence of magnetization in Fe-Pd thin films

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Temperature dependence of magnetization in Fe-Pd thin films
 
Creator KUMAR, MS
 
Subject shape-memory alloys
martensitic-transformation
magnetostriction
field
ni
behavior
magnetic thin film
magnetization
magnetic shape memory effect
fepd film
 
Description Fe-Pd alloys containing about 30 at.% Pd are promising magnetic shape memory alloys and hence draw much attention by materials researchers due to their potential applications in magnetomechanical actuators and sensors. We have carried out magnetization measurements on the dc magnetron sputtered Fe(100-x)Pd(x) thin films. In-plane magnetic hysteresis loops were obtained at 300 K, 77 K and 4.2 K for all the films. From the magnetization curves we have determined the saturation magnetization M(s). At 300 K, the M(s) of the Fe(71)Pd(29) film is about 950emu/cm(3) which is considerably smaller than the other samples. Similar lower M(s) values were obtained for this film at 77 K and 4.2 K as well. Thus, at any given temperature the M(s) of the Fe(71) Pd(29) film is the lowest. This is an important observation because the itinerant ferromagnetic model predicts lower M(s) for this composition when compared with the other compositions. Structural transition is also reported at this composition. The M(s) reported in the literature for the Fe-Pd bulk alloys show a linear decrease with the Pd concentration. The coercivity observed in the Fe(71)Pd(29) film is also the lowest when compared with other compositions, at any temperature. We presume that the coercivity observed in our films is due to grain size effect as the grain size generally plays a predominant role in thin films with nanometer size grains. The ZFC and FC measurements carried out on the films show normal ferromagnetic behaviour. (C) 2009
 
Publisher ELSEVIER SCIENCE BV
 
Date 2011-07-27T00:08:48Z
2011-12-26T12:52:45Z
2011-12-27T05:39:37Z
2011-07-27T00:08:48Z
2011-12-26T12:52:45Z
2011-12-27T05:39:37Z
2009
 
Type Article
 
Identifier MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS, 162(1), 59-63
0921-5107
http://dx.doi.org/10.1016/j.mseb.2009.02.002
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7056
http://hdl.handle.net/10054/7056
 
Language en