Abstract
Trilayered Sm2Co7/Fe/Sm2Co7 spring exchange magnets are fabricated by dc magnetron sputtering on MgO substrates. Very thin layers (0.3–0.7 nm) of Cr and Ti are added at the interfaces of the two magnetic phases. The thickness of Sm2Co7 is kept at 20 nm and Fe at 6 nm while the thickness of Cr and Ti are varied as 0.3, 0.5, and 0.7 nm. The base pressure of sputtering chamber is kept below 10−7 Torr and Ar pressure at 3–8 m Torr. The samples are characterized by x-ray diffraction (XRD) and SQUID magnetometer. We report improvement in exchange coupling of nonacomposite magnets by addition of thin layers of Cr at interfaces.
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