Abstract
In this paper we investigate the influence of hydrostatic pressure (up to 1000 bar) on the magnetization mechanisms of spinel polycrystalline ferrites. The results presented here have been obtained on the composition Ni <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">.36</inf> Zn <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">.64</inf> Fe <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> O <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</inf> . We show that : - the inverse of the initial susceptibility increases linearly with the pressure, - both the critical field H <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">cr</inf> , where the susceptibility begins to increase sharply, and the field H <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">m</inf> corresponding to the maximum of susceptibility, increase also linearly with the pressure. Similar laws have been found for the same composition at other temperatures, as well as for different compositions, - a new phenomenon has to be noted : a "pressure induced hysteresis" of the initial susceptibility, - the initial magnetization curves for different pressures can be reduced to a single curve by taking into account the ratio H/H <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">cr</inf> (where H <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">cr</inf> is the critical unpinning field for the domain walls). The interpretation is based on a model previously proposed by Globus.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
