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【求助】文献两篇
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第一篇： The ferromagnetic-antiferromagnetic properties of copper-manganese and silver-manganese alloys J.S. Kouvel Journal of Physics and Chemistry of Solids Volume 21, Issues 1-2, October 1961, Pages 57-70 第二篇： A ferromagnetic-antiferromagnetic model for copper-manganese and related alloys J.S. Kouvel Journal of Physics and Chemistry of Solids Volume 24, Issue 7, July 1963, Pages 795-822 请发至邮箱： fjn808@163.com 谢谢！！  |
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2楼2010-04-12 10:29:22
第一篇找不到全文
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Abstract Magnetic hysteresis loops displaced from their symmetrical positions about the origin are observed when the alloys of about 5–30 per cent Mn in Cu and 10–25 per cent Mn in Ag are cooled to 1.8°K in a magnetic field. The two remanent magnetizations from each loop are equal both in magnitude and direction and represent a ferromagnetic alignment of a significant fraction of the Mn atomic moments. For each alloy, the hysteresis loop displacement decreases with increasing temperature and its disappearance is attended by large hysteresis losses. At a somewhat higher temperature, the losses vanish and the magnetic susceptibility reaches a maximum. However, the only anomaly in the electrical resistivity vs. temperature curve, indicative of a magnetic transition, occurs at a still higher temperature. All these properties and their dependence on alloy composition are shown to be qualitatively consistent with a microscopic exchange anisotropy model. According to this model, the coexistence of antiferromagnetic and ferromagnetic interactions between Mn atoms of different separation, together with the statistical fluctuations in the local Mn concentration, gives rise to unusual magnetic states in these atomically-disordered alloys. |
3楼2010-04-12 10:40:40
第二篇
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可能是太早了，没有电子版的吧，我在science direct 上面找的 建议你去找纸制版的扫描出来，还是给你abstract吧。 A ferromagnetic-antiferromagnetic model for copper-manganese and related alloys This article is not included in your organization's subscription. However, you may be able to access this article under your organization's agreement with Elsevier. J.S. Kouvela aGeneral Electric Research Laboratory, Schenectady, New York, USA Received 4 January 1963. Available online 9 September 2002. Abstract The microscopically inhomogeneous magnetic structure conceived for Cu---Mn, Ag---Mn and other related alloys at very low temperatures is simulated by a simple model in which the magnetic unit is a small ensemble of mutually-interacting ferromagnetic and antiferromagnetic domains. In the ground state of the hypothetical system each domain-ensemble has zero net magnetization, but when the system is cooled in a magnetic field some of its domain-ensembles are forced into a different state (with a non-zero magnetization) which is stabilized by the growth of a strong anisotropy (kA) in the antiferromagnetic domains. In this field-cooled state, the magnetic hysteresis loops of the system are displaced asymmetrically from the origin, and its torque curves even at very high fields indicate a single easy direction of magnetization. These and related properties and their variation with field applied during cooling and with temperature, as predicted by the model, are in excellent qualitative agreement with the field-cooled behavior of Cu---Mn, Ag---Mn and other alloys. According to this model, the temperature of maximum susceptibility for each of these alloys is to be interpreted not as a Néel temperature but as simply the point at which the anisotropy kA disappears; the alloy does not become paramagnetic until a significantly higher temperature (Tc) is reached. It is predicted that at Tc there will be a kink in the inverse susceptibility vs. temperature curve, and this has been observed experimentally in various Cu-Mn and Ag-Mn alloys. Also consistent with this prediction is the electrical resistivity anomaly (of a type suggestive of a magnetic transition) found at this higher temperature (Tc) in each of these materials. -------------------------------------------------------------------------------- Journal of Physics and Chemistry of Solids Volume 24, Issue 7, July 1963, Pages 795-822 |
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