Chemical ordering at low temperatures in FePd films

We demonstrate that, if a high degree of short range order is present in FePd disordered films, a high value of the long range order parameter S can be obtained by using postgrowth ion irradiation at very low processing temperatures. FePd films deposited monolayer by monolayer at room temperature on...

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Bibliographic Details
Published in:Journal of applied physics 2002-05, Vol.91 (10), p.8082-8084
Main Authors: Ravelosona, D., Chappert, C., Bernas, H., Halley, D., Samson, Y., Marty, A.
Format: Article
Language:English
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Summary:We demonstrate that, if a high degree of short range order is present in FePd disordered films, a high value of the long range order parameter S can be obtained by using postgrowth ion irradiation at very low processing temperatures. FePd films deposited monolayer by monolayer at room temperature on MgO(001) substrates exhibit a very low degree of long range order (S∼0.1) but a high degree of short range order as demonstrated by extended x-ray absorption fine structure measurements. Irradiation with 130 keV He+ ions at low fluences (2.0×1016 ions/cm2) leads to a large increase in the long range order parameter and to a large increase in perpendicular anisotropy for irradiation at substrate temperatures lower than 200 °C. This could have a great impact on the current race toward high magnetic recording density media.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1452277