巻号一覧
22 巻, 7 号
選択された号の論文の3件中1～3を表示しています
- |<
- <
- 1
- >
- >|
論文
-
早乙女 英夫, 立花 敬介1998 年 22 巻 7 号 p. 1144-1149
発行日: 1998年
公開日: 2007/06/29
ジャーナル オープンアクセスFinite element analysis using the dynamic magnetic loss parameter was carried out, in order to evaluate the power loss of Mn-Zn ferrite cores. The accuracy of the numerical analysis was verified by comparing the numerically computed power loss with the analytical solutions at 100 kHz, 200 kHz, 1 MHz, and 2 MHz. The frequency characteristics of the computed core loss coincide with the measured ones. Finite element analysis taking account of the dielectric characteristics of Mn-Zn ferrites clarified the mechanism of the power loss dependence on the core dimensions. The analysis showed that the displacement current in a core causes a magnetic field opposite to the exciting magneto-motive force in a high-frequency region.抄録全体を表示PDF形式でダウンロード (495K) -
岸 達也, 猪俣 浩一郎1998 年 22 巻 7 号 p. 1150-1153
発行日: 1998年
公開日: 2007/06/29
ジャーナル オープンアクセスThe transport properties of ferromagnetic tunnel junctions are investigated. The tunneling currents are calculated on the basis of a Tsu-Esaki-type equation that is extended to a spin-polarized system. The tunnel magnetoresistance decreases with increasing bias voltage, because of the energy dependence of the spin-dependent transmission coefficients. Junctions with different barrier widths show a similar decrease in the tunnel magnetoresistance. The tunnel magnetoresistance as a function of the barrier height increases for a lower barrier height, whereas, it oscillates for a negative barrier height.抄録全体を表示PDF形式でダウンロード (275K) -
姜 小明, 鈴木 俊行1998 年 22 巻 7 号 p. 1154-1159
発行日: 1998年
公開日: 2007/06/29
ジャーナル オープンアクセスAnalysis of the measuring sensitivity of a conventional M-H loop tracer revealed that the sensitivity is limited by undesirable signals, caused by imbalance of a pick-up coil pair, use of a non-ideal electronic integrator, and/or the presence of ambient magnetic or conductive bodies. Most of these noises are periodic and synchronized with the exciting magnetic field at 50-60 Hz. This paper proposes a new scheme utilizing digital signal-processing technique and virtual instrument software, to reduce such noises effectively, taking account of the above-mentioned noise properties. In the scheme, a pick-up coil signal without a magnetic thin film is first sampled and stored in memory as a background noise, then another signal with the thin film is sampled and the stored background noise is reduced. A pick-up coil pair, linear amplifiers, and digital-signal-processing software were optimally designed and installed. A newly designed M-H loop tracer can measure thin soft-magnetic films with a magnetic moment as small as 2.5 × 10-5emu.抄録全体を表示PDF形式でダウンロード (405K)
- |<
- <
- 1
- >
- >|