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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Exchange spring magnet ： ウィキペディア英語版 Exchange spring magnet Hard magnet is the magic material used to make the compass. Its ability to build up static magnetic field finds the applications from refrigerator sticker to electric motor. In pursuit of strong hard magnet, the magnetic material containing rare earth elements, such as neodymium iron boron and samarium cobalt magnet has been invented. Neodymium iron boron magnet is the strongest one, which has a theoretical maximum energy product of 512 kJ/m3 and the magnet with 92% of this value has already been produced. Around 1990, a group of Soviet researchers led by Nikolay Manakov, and independently, Eckart Kneller and Reinhard Hawig in Germany proposed approaches to make so-called exchange spring magnet which comprises two phases of magnetic materials, one having high coercivity and one having high saturation magnetization. The commercial neodymium iron boron magnets have the coercivity of 1000-2000 kiloamperes/meter (kA/m), and the remanent magnetization is 1.2-1.4 teslas (T). But for a soft magnetic material, such as iron cobalt alloy, the saturation magnetization can achieve 2.4 T. The exchange spring magnet takes the advantage of the soft magnetic material and obtain the high energy density. For a simple illustration, by incorporating soft phase and hard phase magnetic material, whose hystersis loops are shown as red and blue curves, the ideal hystersis loop of exchange spring magnet can be expressed as the loop with the dashed line. Another benefit of exchange spring magnet is that the volume fraction of the hard phase material can be made lower than 10% and the rest volume is made of soft magnetic material. Since the cost and short supply of the rare earth elements boosts up the price of the high-performance hard magnet and the price of soft magnetic materials is relatively low, the exchange spring magnet may obtain great properties with low cost. ==Principle== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Exchange spring magnet」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.