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INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.最新文献

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Exchange coupled composite media for perpendicular recording 交换耦合复合介质用于垂直记录
Pub Date : 2005-04-04 DOI: 10.1109/INTMAG.2005.1463505
R. Victora, Xiao Shen
For conventional perpendicular recording media of saturation magnetization M/sub S/ and grain volume V, the ratio of the stabilizing energy barrier /spl Delta/E to the switching field H/sub S/ is /spl xi/=2/spl Delta/E/(M/sub S/H/sub S/V)=1, in contrast to a value of 2 for the case of anisotropy axes tilted at an angle of 45/spl deg/. This means only half the possible resistance to superparamagnetism is gained; it makes writability a serious problem for high density perpendicular media when a large anisotropy is used to compensate decreased grain size. To address this problem, an exchange coupled composite perpendicular recording media has been proposed that increases /spl xi/ by a factor of two, as in 45/spl deg/ tilted media, but reduces some of the difficulties, particularly in fabrication.
对于饱和磁化强度为M/sub S/、颗粒体积为V的传统垂直记录介质,稳定能垒/spl Delta/E与开关场H/sub S/ is /spl xi/=2/spl Delta/E/(M/sub S/H/sub S/V)=1,而各向异性轴倾斜角度为45/spl deg/时稳定能垒/spl Delta/E/为2。这意味着只有一半的可能阻力超顺磁性获得;当使用大的各向异性来补偿减小的晶粒尺寸时,高密度垂直介质的可写性成为一个严重的问题。为了解决这个问题,已经提出了一种交换耦合复合垂直记录介质,与45/spl度/倾斜介质一样,将/spl xi/增加了两倍,但减少了一些困难,特别是在制造方面。
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引用次数: 3
Vortex-antivortex pair driven magnetization dynamics 涡旋-反涡旋对驱动磁化动力学
Pub Date : 2005-04-04 DOI: 10.1109/INTMAG.2005.1463843
Ki-Suk Lee, Byoungwoo Kang, Sang-Koog Kim
Micromagnetic modeling was performed to verify that antivortex states interacting with vortex states can play a crucial role in M dynamics in confined and semi-continuous model systems. Results offer comprehensive insights into the understanding of the static or dynamic properties of M reversal processes, and new features or more details of domain and domain-wall structures observed in continuous real films.
通过微磁建模验证了在受限半连续模型系统中反涡态与涡态的相互作用在M动力学中起着至关重要的作用。结果提供了对M反转过程的静态或动态特性的全面理解,以及在连续真实薄膜中观察到的畴和畴壁结构的新特征或更多细节。
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引用次数: 0
A boundary meshless method for transient Eddy current analysis 瞬态涡流分析的无边界网格法
Pub Date : 2005-04-04 DOI: 10.1109/INTMAG.2005.1464364
Yong Zhang, K. Shao, Youguang Guo, J. Lavers
A boundary meshless method (BMLM) for transient analysis was presented. This method combined a point interpolation method for construction of spatial shape functions for the governing equations. The spatial shape functions satisfied the Kronecker delta function and the essential boundary condition can be directly imposed on the boundary. Eddy current distribution and eddy current density on symmetry axis were also given using the proposed method. The results all proved that BMLM is an effective technique to analyze the transient eddy current problems.
提出了一种用于瞬态分析的无边界网格法。该方法结合点插值法构造控制方程的空间形状函数。满足Kronecker函数和基本边界条件的空间形状函数可以直接施加在边界上。利用该方法还得到了对称轴上的涡流分布和涡流密度。结果表明,BMLM是一种分析瞬态涡流问题的有效方法。
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引用次数: 1
Magnetostrictive characteristics of Fe-Al films formed by ion plating process 离子镀Fe-Al薄膜的磁致伸缩特性
Pub Date : 2005-04-04 DOI: 10.1109/INTMAG.2005.1464330
Konosuke Muramatsu, Noriyoshi Matsuoka, M. Takeuchi, M. Morita, T. Tanakamaru, Y. Matsumura
The crystal structure and magnetostrictive properties of Fe-Al thin films prepared by ion plating process were investigated. Film composition, structure, magnetization and in-plane magnetostriction were obtained by energy dispersive X-ray spectroscopy, X-ray diffraction, vibrating sample magnetometer and cantilever method respectively. The film showed higher magnetostrictive susceptibility and larger magnetostriction at low magnetic fields.
研究了离子镀法制备的Fe-Al薄膜的晶体结构和磁致伸缩性能。利用能量色散x射线能谱、x射线衍射、振动样品磁强计和悬臂梁法分别获得了薄膜的组成、结构、磁化强度和面内磁致伸缩。薄膜在低磁场下表现出较高的磁致伸缩率和较大的磁致伸缩率。
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引用次数: 1
Analysis of power loss in Ni-Cu-Zn ferrites Ni-Cu-Zn铁氧体的功率损耗分析
Pub Date : 2005-04-04 DOI: 10.1109/INTMAG.2005.1464174
E. Otsuki, J. Kim
The power loss analysis was carried out for Ni-Cu-Zn ferrite samples with different content of NiO and ZnO. The power loss, Pc/spl nu/ decreases monotonically with increasing temperature and attains to a certain value at around 100/spl sim/120 degrees Celsius. The frequency dependence of Pc/spl nu/ can be explained by Pc/spl nu//spl sim/f, and n is independent of the frequency, f up to 1 MHz. The Pc/spl nu/ decreases with an increase in ZnO/NiO. The Pc/spl nu/ was separated to hysteresis loss, Ph and residual loss, (Pc/spl nu/-Ph). The temperature characteristics and compositional dependence of Pc/spl nu/ can be attributed to the Ph, while (Pc/spl nu/-Ph) is not affected by both temperature and ZnO/NiO. By analyzing temperature and composition dependence of Ph and initial permeability, u/sub i/ following equations could be formularized. u/sub i/u/sub 0/ = I/sub s//sup 2//(K/sub I/ + bs/sub 0/l/sub s/) (1), Wh = 13.5(I/sub s//sup 2//u/sub i/u/sub 0/) (2), where u/sub 0/ is permeability of vacuum, I/sub s/ saturation magnetization, K/sub I/ anisotropy constant, s/sub 0/ internal heterogeneous stress, l/sub s/ magnetostriction constant, b unknown constant. Wh hysteresis loss per one cycle of excitation (Ph = Wh*f). Steinmetz constant of Ni-Cu-Zn ferrites, m = 1.64/spl sim/2.2 is smaller than the one of Mn-Zn ferrites, which suggests the difference of loss mechanism between these materials.
对NiO和ZnO含量不同的Ni-Cu-Zn铁氧体样品进行了功率损耗分析。功率损耗Pc/spl nu/随温度升高而单调减小,在100/spl sim/120℃左右达到一定值。Pc/spl nu/的频率依赖性可以用Pc/spl nu//spl sim/f来解释,n与频率无关,f最高可达1 MHz。Pc/spl nu/随ZnO/NiO的增加而减小。将Pc/spl nu/分解为滞后损耗、Ph和残余损耗(Pc/spl nu/-Ph)。Pc/spl nu/的温度特性和组分依赖性主要受Ph的影响,而(Pc/spl nu/-Ph)不受温度和ZnO/NiO的影响。通过分析Ph值与初始渗透率对温度和组分的依赖关系,可以得到u/sub i/的公式。u/sub i/u/sub 0/ = i/ sub s//sup 2//(K/sub i/ + bs/sub 0/l/sub s/) (1), Wh = 13.5(i/ sub s//sup 2//u/sub i/u/sub 0/)(2),其中u/sub 0/为真空磁导率,i/ sub s/饱和磁化强度,K/sub i/各向异性常数,s/sub 0/内部非均质应力,l/sub s/磁致伸缩常数,b未知常数。每一个激励周期的迟滞损耗(Ph = Wh*f)。Ni-Cu-Zn铁氧体的Steinmetz常数m = 1.64/spl sim/2.2小于Mn-Zn铁氧体的Steinmetz常数,说明两者的损耗机理存在差异。
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引用次数: 1
Absence of ferromagnetism and strong orbital coupling in carrier rich Zn/sub 1-x/In/sub x/Co/sub 0.075/O 富载流子Zn/sub - 1-x/ in /sub -x/ Co/sub 0.075/O的无铁磁性和强轨道耦合
Pub Date : 2005-04-04 DOI: 10.1109/INTMAG.2005.1463818
X. Wang, G. Peleckis, S. Dou
Polycrystalline samples of Zn/sub 1-x/In/sub x/Co/sub 0.075/O (0.010/spl les/x/spl les/0.020) diluted magnetic semiconductors were prepared by the rapid oxalate decomposition technique. Phase purity is analyzed by means of X-ray diffraction technique and structures are refined by Rietveld refinement technique. Bulk conductivity of the polished pellets was measured by two-point probe technique at 295 K. Magnetic properties were analyzed with magnetic property measurement system. Samples show paramagnetic behavior and Curie-Weiss fitting at high temperature range gave effective magnetic moment of Co ions. Magnetization behavior caused by applied magnetic field was also investigated. High itinerant carrier concentration was achieved but no ferromagnetism was observed in the samples.
采用草酸盐快速分解技术制备了Zn/sub 1-x/In/sub x/Co/sub 0.075/O (0.010/spl les/x/spl les/0.020)稀释磁性半导体多晶样品。用x射线衍射技术分析了相纯度,并用Rietveld精细化技术对其结构进行了细化。用两点探针技术在295 K下测量了抛光球团的体积电导率。利用磁性能测量系统对其磁性能进行了分析。样品显示出顺磁性,在高温范围内居里-魏斯拟合得到Co离子的有效磁矩。研究了外加磁场引起的磁化行为。获得了较高的流动载流子浓度,但样品中未观察到铁磁性。
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引用次数: 0
Nonellipsoidal shapes with demagnetizing energy being independent on direction of magnetization 具有退磁能量与磁化方向无关的非椭球形状
Pub Date : 2005-04-04 DOI: 10.1109/INTMAG.2005.1464488
S. Sakurai, N. Soda, M. Kobayashi
The demagnetizing energy being required in obtaining a demagnetizing factor for a single-domain particle of nonellipsoidal shape, with spontaneous magnetization in an arbitrary direction is investigated. The concept of demagnetizing factors plays an important role in theoretical interpretation of many ferromagnetic phenomena. It was found that demagnetizing energy per unit volume of a uniformly magnetized cube is exactly the same as for a uniformly magnetized sphere and independent on the magnetization direction. The body considered is that with two threefold rotation axes.
研究了具有任意方向自发磁化的非椭球形状的单畴粒子在获得退磁因子时所需要的退磁能量。退磁因子的概念在许多铁磁现象的理论解释中起着重要的作用。结果表明,均匀磁化立方体的单位体积退磁能与均匀磁化球体完全相同,且与磁化方向无关。所考虑的物体是具有两个三轴旋转的物体。
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引用次数: 0
Downward flow diffusion and meniscus flow by electromagnetic stirring 电磁搅拌向下流动扩散和半月板流动
Pub Date : 2005-04-04 DOI: 10.1109/INTMAG.2005.1464213
K. Fujisakir, Y. Tomizawa
A new combination process which consists of rectangular shaped nozzle with single output and electromagnetic stirring (EMS) is considered to obtain high inner quality steel during continuous casting process. The usefulness of this process is evaluated by means of magnetohydrodynamic (MHD) calculation. The proposed process with the rectangular shaped nozzle and EMS at meniscus seems to realize both some velocity at downward flow diffusion and meniscus flow.
为了在连铸过程中获得高内质钢,提出了一种由单输出矩形喷嘴和电磁搅拌组成的新型组合工艺。通过磁流体力学(MHD)计算对该方法的有效性进行了评价。在半月板处使用矩形喷嘴和EMS的过程似乎既实现了向下流动扩散的速度,也实现了半月板流动的速度。
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引用次数: 0
Magnetic hollow silica nanotubes for bio-applications 生物应用磁空心二氧化硅纳米管
Pub Date : 2005-04-04 DOI: 10.1109/INTMAG.2005.1463829
P. Gao, D. Caruntu, L. Shao, M. Yu, J.F. Chen, C. O'connor, W.L. Zhou
In this paper, a novel synthetic route is reported for magnetic silica nanotubes (MSNTS) via a sol-gel method by using nanosized calcium carbonate (CaCO/sub 3/) nanoneedle as a sacrificial template, and Fe/sub 3/O/sub 4/ nanoparticle and tetraethoxysilane (TEOS) as precursors. The samples were investigated by field scanning electron microscope (FESEM) and transmission electron microscope (TEM). Magnetic properties were measured with a Quantum Design MPMS-5S SQUID magnetometer. The diameter of nanoneedles ranges from 50 to 80 nm. The length of the nanoneedles is about micron size. After the sol-gel coating and weak acid etching, silica nanotubes with a shell of 20-40 nm were obtained. Electron energy dispersive X-ray analysis (EDS) indicated that all CaCO/sub 3/ nanoneedles were removed during the etching. The nanoparticles were randomly embedded inside the shells of silica nanotubes. Zero-field-cooled (ZFC) and field-cooled (FC) magnetization data in the temperature range of 10 to 300 K were acquired. A field of 100 Oe was applied as the sample was cooled to the lowest temperature and the magnetization was measured as the sample was heated from 5 to 300 K in the field of 100 Oe. The ZFC curve shows a maximum at 291 K, which is the blocking temperature (T/sub B/). MSNTS exhibit superparamagnetism and ferromagnetism above and below the blocking temperature. It is therefore expected that MSNTS can be exploited as delivery vehicles and supports in bioscience applications.
本文报道了以纳米碳酸钙(CaCO/sub - 3/)纳米针为牺牲模板,铁/sub - 3/O/sub - 4/纳米颗粒和四乙氧基硅烷(TEOS)为前驱体,采用溶胶-凝胶法制备磁性二氧化硅纳米管(MSNTS)的新路线。采用场扫描电镜(FESEM)和透射电镜(TEM)对样品进行了研究。用量子设计MPMS-5S SQUID磁强计测量了其磁性能。纳米针的直径在50 ~ 80纳米之间。纳米针的长度大约是微米大小。经溶胶-凝胶包覆和弱酸刻蚀后,得到了20 ~ 40 nm的硅纳米管。电子能量色散x射线分析(EDS)表明,在蚀刻过程中,所有的CaCO/sub - 3/纳米针都被去除。这些纳米颗粒被随机嵌入二氧化硅纳米管的外壳中。获得了10 ~ 300 K温度范围内的零场冷(ZFC)和场冷(FC)磁化数据。当样品冷却到最低温度时,施加100 Oe的电场,当样品在100 Oe的电场中从5到300 K加热时,测量磁化强度。ZFC曲线在291 K处达到最大值,即阻滞温度(T/sub B/)。MSNTS在阻滞温度上下表现出超顺磁性和铁磁性。因此,期望MSNTS可以作为生物科学应用的运载工具和支持。
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引用次数: 1
Application of fine-grained doubly oriented electrical IPM synchronous motor 细粒度双取向电IPM同步电动机的应用
Pub Date : 2005-04-04 DOI: 10.1109/INTMAG.2005.1464324
T. Tomida, N. Sano, S. Hinotani, K. Fujiwara, H. Kotera, N. Nishiyama, Y. Ikkai
The magnetic core materials for motors have been mostly limited to non-oriented electrical steels of which crystallographic texture is almost random, although there is a possibility to greatly improve performance of motors by the use of steels with textures such as {100}<001>.The purpose of this research is to investigate how the performance of motors can be improved by the use of such a textured material by building actual motors using a doubly oriented electrical steel that has a strong {100}<001> texture. This key material in this investigation has been prepared by the process so-called oxide-separator-induced decarburization that has been found recently.
电机磁芯材料大多局限于晶体结构几乎随机的无取向电工钢,尽管有可能通过使用具有{100}结构的钢来大大提高电机的性能。本研究的目的是通过使用具有强{100}纹理的双取向电工钢来制造实际的电机,研究如何通过使用这种纹理材料来改善电机的性能。这项研究的关键材料是通过最近发现的所谓的氧化分离器诱导脱碳工艺制备的。
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引用次数: 1
期刊
INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.
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