Uniaxial magnetic anisotropy in Pd/Fe bilayers on Al2O3 (0001) induced by oblique deposition

Abstract

This study reports the preparation of self-organized 1-dimensional magnetic structures of Fe on Al 2 O 3 (0001) by oblique deposition. The x-ray diffraction (XRD) results in this study show the preferred (110) texture of the Fe films. XRD and extended x-ray adsorption fine structure measurements indicate larger oblique deposition angle (65) leads to more disorder in the Fe crystalline structure. After capping with a Pd overlayer, the Pd/Fe/Al 2 O 3 (0001) still exhibits uniaxial magnetic anisotropy induced by the underlying 1-dimensional Fe nanostructure. This uniaxial magnetic anisotropy changes with the variation in Fe thickness and oblique deposition angle. These results clearly indicate the feasibility of manipulating uniaxial magnetic anisotropy and crystalline order through the oblique deposition of magnetic materials. V

Hydrogenation-induced change of magneto optical Kerr effect in Pd/Fe bilayers

“…In 10 ML Pd/30 ML Fe, the Fe (110) peak appears at 22:5 , but there are no observable peaks for Pd because of the limited thickness. 12 Pd-Fe alloy at the interface. Because the atom size of Pd is larger than that of Fe, more Pd content in the Fe layer will lead to the expansion of Fe crystalline structure and the smaller diffraction angle as well.…”

“…12 The deposition rates of Pd and Fe were calibrated from the epitaxial growth on Cu(100) by using Auger electron spectroscopy. Thus in this report, 1 ML is equivalent to the nominal surface atom density of Cu(100), that is, 1 ML ¼ 1:54 Â 10 15 atoms=cm 2 .…”

Modulation of magnetic coercivity in Ni thin films by reversible control of strain

“…The 2.7 nm Pd/Ni/14 nm Pd trilayer films were grown on mica sheets (∼10 μm) by electron-beam-heated evaporation in a vacuum chamber with a base pressure of 3 Â 10 À 9 Torr [37]. The thickness of Ni ranged over few tens nm, while the thicknesses of the top and the bottom Pd layer were always fixed.…”

Coercivity of Nd-Fe-B hot-deformed magnets produced by the spark plasma sintering method

“…A number of studies have been conducted with the aim of increasing the coercivity of Nd-Fe-B magnets. [11][12][13][14] In particular, the addition of Nd-Cu alloys such as Nd 70 Cu 30 and Nd 80 Cu 20 has been found to be highly effective in increasing the coercivity of Nd-Fe-B magnets. Nd-Fe-B magnets can be categorized into two types: one produced by sintering, and the other by hot deformation.…”

“…With the extremely short supply of Dy for Nd-Dy-Fe-B permanent magnets in the international market, demand has arisen for the development of a new permanent magnet that does not contain Dy. 5,6 Various new compounds such as NdFe 12 and Sm 5 Fe 17 have been studied for this purpose. [7][8][9][10] These compounds are highly promising, but their practical application can be expected to take a long time.…”