Magnetostriction and Coercivity of Soft Magnetic Fe-(Al, Ga)-(P, C, B, Si) Bulk Glassy Alloys
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Magnetostriction and Coercivity of Soft Magnetic Fe-(Al, Ga)-(P, C, B, Si) Bulk Glassy Alloys Akihiro Makino, Teruo Bitoh and Akihisa Inoue 1 Department of Machine Intelligence and Systems Science, Faculty Systems Science and Technology, Akita Prefectural University, Honjo 015-0055, Japan. 1 Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan. ABSTRACT The relationship between coercivity (Hc) and magnetostriction (λs) of the glassy Fe-(Al, Ga)-(P, C, B, Si) alloys has been discussed. The glassy Fe-(Al, Ga)-(P, C, B, Si) alloys exhibit lower Hc and lower Is compared with the conventional Fe-based amorphous alloys with the same λs and Fe content, respectively. Theoretical analysis on the basis of domain-wall movement suggests that the low Hc results from the long-range homogeneous structure of the glassy alloys, which realizes a low density of pinning centers. The good combination of high glass-forming ability and good soft magnetic properties (especially low Hc) indicates the possibility of future development as new bulk glassy soft magnetic materials.
INTRODUCTION To date, it has been found that bulk glassy alloys in a number of alloy systems such as Ln-Al-TM [1], Mg-Ln-TM [2], Zr-Al-TM [3], Ti-Zr-TM [4, 5] and Ti-Zr-Be-TM [6] etc. (Ln = lanthanide metals, TM = transition metals) have a wide supercooled liquid region (∆Tx = crystallization temperature (Tx) − glass transition temperature (Tg)) over 100 K before crystallization. The appearance of the wide supercooled liquid region implies that the alloys have high resistance against crystallization. Consequently, these bulk glassy alloys with large ∆Tx values have been confirmed to have an extremely large glass-forming ability (GFA), which enables the production of bulk glassy samples. These bulk glassy alloys have so unique properties that they will be expected to be very useful materials for industrial use. Practically, the Zr-based glassy alloy has been used as a high specific-strength material. Recently, some kinds of soft magnetic glassy alloys with large ∆Tx combined with good soft magnetic properties have been found [7, 8]. We have already reported that the Fe-(Al, Ga)-(P, C, B, Si) glassy alloy has a wide ∆Tx of about 60 K and its maximum thickness to form a single glassy phase was about 280 µm prepared by the single-roller melt-spinning method [9, 10]. It is interesting that the Fe-(Al, Ga)-(P, C, B, Si) glassy alloys exhibit good soft magnetic properties, whereas their magnetostriction (λs) is relatively large. In this paper, we compare the magnetic properties of the Fe-(Al, Ga)-(P, C, B, Si) glassy alloys with those of the conventional Fe-based amorphous alloys, and clarify the feature of the
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glassy alloys as a soft magnetic material.
MAGNETIC PROPERTIES OF GLASSY Fe-(Al, Ga)-(P, C, B, Si) ALLOYS COMPARED WITH THOSE OF CONVENTIONAL AMORPHOUS ALLOYS Table I shows the magnetic properties, ∆Tx and maximum sample thickness (tmax) for glass formation of the Fe-(Al, Ga)-(P, C, B, Si) glassy alloys [11, 12]. Here, coer
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