Microstructure and magnetic behaviors of Fe/Hf multilayers by vapor deposition

Influence of heat treatment on the structure and magnetic properties of the Co/Zr and Co/Hf multilayer amorphous films

“…Similar results have been presented for Co/Zr and Co/Ti multilayers [18], where d crit ¼ 26 Å and for Fe/Hf multilayers [19], where d crit ¼ 22 Å . d crit is much lower than the critical nucleus size of several hundred angstroms calculated for the crystallization of amorphous Co-Zr rapidly quenched alloys [17].…”

The Effect of the Constituent Metal Layer Thickness on the Microstructure and Magnetic Properties of Fe/Y Multilayers

“…6 to 8, it was also found that the easy direction of magnetization of all films lies in the film plane, and there was no obvious perpendicular magnetization tendency in the films with varying Fe and Y layer thickness, which was similar to that observed in Fe/Ti and Fe/Hf multilayers [25,26].…”

Magnetic properties and microstructure of vapour-deposited Fe/Hf films upon thermal annealing

“…One can see that for series A as-deposited Fe/Hf multilayers (t Hf = 13.2 nm), when t F e 4.2 nm, the magnetic moment per Fe atom in the Fe/Hf films was about the same as in bulk Fe (2.15 µ B ), i.e. for Fe(4.2 nm)/Hf(13.2 nm), Fe(6.3 nm)/Hf(13.2 nm) and Fe(12.2 nm)/Hf(13.2 nm) films, it was about 2.09 µ B , 1.97 µ B and 2.11 µ B , respectively [16]. When the films were annealed at 380 and 550 • C for 20 min, respectively, the magnetic moment per Fe atom reduced considerably with elevated annealing temperature.…”

“…When t F e 2.2 nm and t Hf = 13.2 nm, the magnetic moment per Fe atom in the as-deposited film was obviously lower than that of bulk Fe, i.e. 0.23 µ B for Fe(2.2 nm)/Hf(13.2 nm) and 0.39 µ B for Fe(1.1 nm)/Hf(13.2 nm), respectively, because an amorphous Fe phase formed in the as-deposited films [16]. After thermal annealing at 380 • C for 20 min, the magnetic moment per Fe atom in Fe(2.2 nm)/Hf(13.2 nm) films increased slightly from 0.23 µ B to 0.34 µ B .…”

“…The corresponding crystallographic spacing distances were measured and are listed in table 2. From figure 5(a) and table 2, it can found that, for the asdeposited samples, the SAD pattern of the sample consists of a set of bcc Fe diffraction lines and some halos from the Hf-rich amorphous phase, which suggested that the Hf layer grew in an amorphous structure and the Fe layer in a bcc one [16]. When the films were annealed at 380 • C for 20 min, some new diffraction lines, along with the halos, appeared which were verified to be from the FeHf 2 phase (see figure 5(b)).…”