Kazuaki Fukamichi

  • Citations Per Year
Learn More
The effects of the addition of Co on the magnetic anisotropy in Ni(55-x)Fe(18)Ga(27)Co(x) (x = 1-6) single-variant ferromagnetic shape memory alloys have been investigated. By the addition of Co from 1 to 6 at.%, the Curie temperature T(C) is increased from 318 to 405 K, keeping the martensitic transformation temperatures above room temperature. As a(More)
Measurements of the Curie temperature T<inf>c</inf>, coercive force H<inf>c</inf>, thermal expansion, and magnetoelasticity effects of Fe-Tb alloys in both film and bulk form, are reported. The compositional dependence of H<inf>c</inf> was determined, and were found to be essentially the same for both film and bulk material. Anomalous thermal expansion(More)
The single-variant state and the magnetocrystalline anisotropy in a single crystal Co41Ni32Al27 ferromagnetic shape memory alloy (FSMA) have been investigated. After applying compressive stress, the single-variant state was confirmed by optical micrograph and linear thermal expansion measurements. In the heating process for the single-variant martensite(More)
In this report, the differences in the magnetic moment, high-field susceptibility and temperature dependence of magnetization between crystalline and amorphous Co-Y alloys are discussed. The amorphous samples have higher magnetic moments than the crystal phase samples. The same tendency was observed in the spin wave dispersion coefficient. Co-40%Y alloy(More)
The concentration and temperature dependences of coercive force have been studied on Fe-Sm and other Fe-rare earth (R) amorphous alloys prepared by sputtering. The coercive force of Fe-Sm amorphous alloys shows a large concentration dependence, as expected by the random anisotropy model. There is a linear relationship between log H<inf>c</inf> and T. For(More)
In Fe-La amorphous alloys, composition does not have a great effect on the Curie temperature (T<inf>c</inf>) at high concentrations, but there was a significant drop at low concentrations which is believed due to a strong antiferromagnetic interaction. The magnetization of alloys with a higher La concentration saturated more easily, but for low(More)
Crystalline Ce alloys often exhibit properties which are different from other rare-earth alloys. We wanted to know if a similar tendency was present in amorphous phase Ce alloys. The magnetic properties of such alloys were compared with the results of other rare-earth alloys. The concentration dependence of the Curie temperature of Fe-Ce alloys is similar(More)
Effects of pressure P on the magnetic momentM and the Curie temperature TC have been investigated for La(FexSi1 x)13 above and below the magnetic phase boundary concentration x 1⁄4 0:86, where the ferromagnetic-paramagnetic transition at TC changes from the first-order (x 0:86) to the second-order (x < 0:86). The pressure coefficient ofM exhibits a sluggish(More)
The magnetic moment, Curie temperature and Invar effects in amorphous alloys are briefly reviewed. The average magnetic moment ¿¿ of binary amorphous alloys of Fe, Co, and Ni with an early transition metal E shows a systematic trend, that is, the value of ¿¿ becomes larger as the valence and size differences between Fe, Co, Ni and E increase. Comparison of(More)