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57Fe Mössbauer and magneto-optical Kerr effect (MOKE) study of transcritical state in permalloy (FexNi100-x) thin films.
- Source :
- Hyperfine Interactions; 11/15/2021, Vol. 242 Issue 1, p1-9, 9p
- Publication Year :
- 2021
-
Abstract
- The present work reports the study of transcritical state of magnetic anisotropy in Fe<subscript>x</subscript>Ni<subscript>100-x</subscript> films as a function of film thickness and composition. The transcritical state is a manifestation of weak perpendicular magnetic anisotropy resulting in peculiar hysteresis loop and stripe magnetic domains above a critical thickness of film. Signatures of transcritical state, corroborated by the formation of stripe domains, are observed in the magneto optical Kerr effect(MOKE) data and magnetic force microscopy (MFM) data of Fe<subscript>x</subscript>Ni<subscript>100-x</subscript> films with ≈ 75 nm thickness for x = 7. The effect of thickness on the formation of transcritical state is studied for Fe<subscript>9</subscript>Ni<subscript>91</subscript> films and it is observed that films with thickness ≥ 105 nm exhibit transcritical state. Further a quantitative analysis of magnetic texture is carried out by <superscript>57</superscript>Fe conversion electron Mössbauer spectroscopy (CEMS) measurements for the thickness variation samples. The CEMS data show a systematic variation in the area ratio of second and third line intensity as a function of thickness corroborating the MOKE data. The films are studied as a function of thermal annealing and it is observed that the transcritical state still preserved for Fe<subscript>9</subscript>Ni<subscript>91</subscript> films of higher thickness even after annealing at 300 <superscript>∘</superscript>C. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03043843
- Volume :
- 242
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Hyperfine Interactions
- Publication Type :
- Academic Journal
- Accession number :
- 153585021
- Full Text :
- https://doi.org/10.1007/s10751-021-01753-3