著者

中村 基訓 木村 道哉 末岡 和久 武笠 幸一

出版者

公益社団法人 日本磁気学会

雑誌

日本応用磁気学会誌 (ISSN:02850192)

巻号頁・発行日

vol.24, no.4_2, pp.771-774, 2000 (Released:2007-02-26)

参考文献数

14

被引用文献数

2 2

---

A variety of techniques have been proposed to measure surface magnetic properties using scanning probe microscopy. The most widely used is magnetic force microscopy (MFM). In many cases, however, it is hard to analyze MFM data quantitatively. A magnetoresistive (MR) device is also a candidate for such a sensor that can operate at room temperature with high sensitivity. Yamamoto et al. have demonstrated a scanning magnetoresistance microscope (SMRM) using a commercially available MR read-head for a hard disk. Since they held the MR head on a slider, there was no feedback system to control the distance between sample and sensor. We made a cantilever for the MR sensor to get the surface topography and magnetic properties simultaneously. Its magnetic field sensitivity with 10-mA sensing current is 90 μV/Oe, and our roughly estimated minimum field resolution is a few mOe (only Johnson noise is assumed with 10-kHz bandwidth at room temperature), which is much better than that of a scanning Hall probe microscope.

著者

内山 剛 牧野 正義 毛利 佳年雄

出版者

公益社団法人 日本磁気学会

雑誌

日本応用磁気学会誌 (ISSN:02850192)

巻号頁・発行日

vol.16, no.3, pp.556-559, 1992-06-01 (Released:2013-01-11)

参考文献数

3

被引用文献数

2 2

---

A transistor logic memory module based on the Royer oscillator type magnetic multivibrator is presented, in which a HTcSC thin disk core having six coils tightly set around it is connected with two switching transistors. The oscillation of this module is initiated by applying a pulse current to a coil and the phase of oscillation is controlled by the sign of the trigger pulse. That is, this module is a phase memory type logic device such as Parametron. Moreover, oscillation is terminated by applying a pulse current to a small transistor which shorts another coil of the HTcSC. We can assign two oscillating states with different phases to the numerical values ±1 and the non-oscillating state to 0. This logic is decided by a majority of multi-input, so that this module has applications in the field of neural network system.

著者

増田 正美

出版者

公益社団法人 日本磁気学会

雑誌

日本応用磁気学会誌 (ISSN:02850192)

巻号頁・発行日

vol.3, no.3, pp.81-88, 1979-08-31 (Released:2010-05-18)

参考文献数

7

著者

倉田 啓明 白川 究 中島 冶 村上 孝一

出版者

公益社団法人 日本磁気学会

雑誌

日本応用磁気学会誌 (ISSN:02850192)

巻号頁・発行日

vol.17, no.2, pp.537-540, 1993-04-01 (Released:2007-12-03)

参考文献数

5

被引用文献数

1 1

---

For miniaturization of magnetic devices, it is necessary to increase the operating frequency. We have studied thin-film micro-inductors to realize a high operating frequency and reduce the iron loss. In this paper, we propose a thin-film micro-transformer with high operating frequency achieved by application of a multilayered magnetic film to the core. The magnetic core is made of amorphous CoFeSiB monolayer film or a CoFeSiB/SiO2 multilayered film. The induced magnetic anisotropy is controlled so that the exciting direction of the coil is along the hard axis. The total thickness of the magnetic layer is 3μm and the size of the core is 0.6 mm × 2.3 mm. The experimental transformers show that a multilayered core is useful for improving the transmission loss of transformers at high operating frequency. A thin-film transformer whose transmission loss is 2.7 dB from 100 MHz to 250 MHz has been developed. This value is smaller than the 5.3 dB of the monolayer core.

著者

近角 聰信

出版者

(社)日本応用磁気学会

雑誌

日本応用磁気学会誌 (ISSN:02850192)

巻号頁・発行日

vol.4, no.2, pp.44-47, 1980-05-31 (Released:2010-05-18)

参考文献数

23

被引用文献数

1

---

After describing a history of Invar alloys, analyses of anomalous temperature dependence of Fe-Ni Invar alloys are introduced. The anomalous magnetic and elastic properties of the same alloys are wellcorrelated with that of thermal expansion. Effect of high magnetic field and that of cold-rolling are also described.