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Assembly of uniaxially aligned rare-earth-free nanomagnets
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Image of FIG. 1.
FIG. 1.

A schematic illustration of the gas-aggregation-type cluster-deposition method used for the growth of HfCo7 nanoparticles.

Image of FIG. 2.
FIG. 2.

(a) X-ray diffraction patterns of bulk HfCo7 and unaligned HfCo7 nanoparticles (NPs), where the estimated XRD peak positions corresponding to the orthorhombic structure using TOPAS are shown as black-dotted vertical lines. (b) Transmission electron microscope image of NPs. The corresponding particle-size histogram is given as an inset, where σ and d are the standard deviation and average particle size, respectively.

Image of FIG. 3.
FIG. 3.

(a) M-H curves of the unaligned HfCo7 NPs measured at 10 K and 300 K and bulk alloy measured at 300 K. (b) An estimation of magnetic anisotropy constant K1 from the high-field region of M vs. H curves using the law of approach to saturation method (see Refs. 1222–24). The solid spheres and lines represent the corresponding experimental data and fitting, respectively.

Image of FIG. 4.
FIG. 4.

The unaligned exchanged-coupled HfCo7:Fe-Co nanocomposites with different volume fractions (vol. %) of soft Fe-Co phase: (a) X-ray diffraction patterns, where the red and green-dotted vertical lines represent the standard positions of diffraction peaks corresponding to HfCo7 and Fe-Co, respectively. (b) The expanded room-temperature M-H curves.

Image of FIG. 5.
FIG. 5.

Easy-axis alignment of HfCo7 nanoparticles (NPs): (a) Schematic illustration of the alignment method using a set of permanent magnets (NS), prior to deposition on substrate, where the sputtering guns used for depositing Fe-Co soft phase and cap layer are not shown here. (b) Three dimensional view of the substrate is also given—in order to show the direction of the applied magnetic field (x-axis) used for alignment with respect to the substrate plane. The expanded room-temperature M-H curves of the aligned NPs measured along the easy (x-axis) and hard (y-axis) directions for (c) HfCo7 NPS and (d) HfCo7:Fe-Co nanocomposites with 18 vol. % of Fe-Co, whereas the M-H curves for the corresponding unaligned samples also are given for comparison.


Generic image for table
Table I.

Comparison of Hc and Mr /Ms at 300 K measured along easy (x-axis) and hard (y-axis) directions of the magnetically aligned HfCo7 nanoparticles and HfCo7:Fe-Co nanocomposites.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Assembly of uniaxially aligned rare-earth-free nanomagnets