based soft magnetic materials
Tài liệu Chapter XII Magnetic materials pdf
Ngày tải lên :
21/12/2013, 03:15
... signs to the magnetic effects: paramagnetism and diamagnetisme Strong magnetic effects in ferromagnetic materials 4/1/2008 Weak magnetic effects in paramagnetic materials in diamagnetic materials ... materials Such materials are called paramagnetic For these materials M > but fairly small 4/1/2008 12 2.3 Permeability and susceptibility: We have said that for paramagnetic materials the total magnetic ... materials: The third type of materials is called ferromagnetic materials, which includes iron, nickel, cobalt, … These materials manifest strong magnetic effects The magnetic field inside them...
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Physics of magnetism and magnetic materials k buschow, f de boer
Ngày tải lên :
17/03/2014, 13:39
... Recording Materials 13.1 Introduction 13.2 Magneto-Optical Recording Materials 13.3 Materials for High-Density Magnetic Recording References 131 131 133 139 145 CONTENTS vii Chapter 14 Soft- Magnetic Materials ... 14.2 Survey of Materials 14.3 The Random-Anisotropy Model 14.4 Dependence of Soft- Magnetic Properties on Grain Size 14.5 Head Materials and Their Applications 14.5.1 High-Density Magnetic- Induction ... on soft ferromagnetic objects The applications of magnetic materials in information technology are continuously growing In this treatment, a survey will be given of the most common modern magnetic...
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cullity - introduction to magnetic materials 2e (wiley, 2009)
Ngày tải lên :
03/04/2014, 12:36
... 1.12 Typical magnetization curves of (a) a diamagnetic; (b) a paramagnetic or antiferromagnetic; and (c) a ferromagnetic of ferrimagnetic 1.7 MAGNETIC MATERIALS 15 leading to irreversible behavior ... Temperature Compensation Alloys / 467 13.5.4 Uses of Soft Magnetic Materials / 467 13.6 Soft Ferrites / 471 Problems / 476 13.4 14 HARD MAGNETIC MATERIALS 14.1 14.2 14.3 14.4 14.5 14.6 14.7 14.8 ... negative for diamagnetics, very small and positive for paramagnetics and antiferromagnetics, and large and positive for ferro- and ferrimagnetics The negative value of M for diamagnetic materials means...
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Báo cáo hóa học: " Hf-based high-k materials for Si nanocrystal floating gate memories" doc
Ngày tải lên :
21/06/2014, 05:20
... (99.995%) targets were used as starting targets to grow high-k (HfObased) and low-k (pure or Si-rich SiO2) layers, respectively The HfO -based layer was grown by sputtering either pure HfO2 or composed ... where (1) the tunnel layer is HfO -based material (either pure or Sirich HfO2), (2) the charge storage layer is Si-rich SiO2, and (3) the control layer is SiO2 or HfO -based layer To study the effect ... for obtaining better electrical properties Based on the abovementioned results, the deposition and postdeposition conditions elaborated for single HfO -based layers and for SRSO/SiO2 MLs were adopted...
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Báo cáo hóa học: " Factor-Graph-Based Soft Self-Iterative Equalizer for Multipath Channels" ppt
Ngày tải lên :
23/06/2014, 00:20
... namely the scheme based on the a posteriori probability (APP) algorithm, the one based on the linear-MMSE -soft- interferencecancelation (LMMSE-SIC), and the one based on matchfilter -soft- interference-cancelation ... designs of the factor-graph -based soft iterative equalizer, which we will discuss in Section 4.3 SOFT SELF-ITERATIVE EQUALIZER BASED ON FACTOR GRAPH The considered soft self-iterative equalizer ... a-posteriori-probability- (APP-) based scheme, linear-MMSE -soft- interference-cancellation(LMMSE-SIC- )based scheme, and match-filter -soft- interference-cancellation- (MF-SIC- )based scheme, to compute (3),...
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ADVANCED MAGNETIC MATERIALS docx
Ngày tải lên :
27/06/2014, 00:20
... and other essential properties of the magnetic materials. It is applicable to a large variety of magnetic materials. Research on magnetic materials is a dynamically expanding field ... for the identification of the magnetic properties of the material in an electromagnetic device ‐ an electromagnetic core inductor. Chapter 8. The last chapter tackles the problem of modeling of magnetic ... ferromagnetic and ferroelectric materials provide a unique way of converting magnetic field into electric field. This process involves stresses at the interface between these materials and takes advantage ...
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Neutron scattering from magnetic materials potx
Ngày tải lên :
27/06/2014, 06:20
... new magnetic materials are usually synthesized as polycrystalline materials the magnetic structures are often determined from powder neutron diffraction If the ordered magnetic phase is ferromagnetic ... 5.9 Modulated magnetic structures in MnSi and FeGe 5.10 Microscopic origin of modulated magnetic structures Magnetic structures of novel electronic materials 6.1 Magnetic structures ... properties characterized by their response to an applied magnetic field or the magnetic susceptibility They are called magnetic materials Magnetic atoms are mainly situated in three rows of the...
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Báo cáo y học: "Voxel-based structural magnetic resonance imaging (MRI) study of patients with early onset schizophrenia" potx
Ngày tải lên :
08/08/2014, 23:21
... were assessed using the Brain Analysis Morphological Mapping (BAMM) software package http://www-bmu.psychia try.cam.ac.uk/software This process has previously been described in detail for both ... development (that is, the period before adolescence) [27,28] In the present study, we conducted voxel -based structural MRI analyses to explore any pattern of regional brain tissue volume abnormalities, ... morphology in patients with EOS, defined herein as schizophrenia with onset under age 18 [4-6] Using magnetic resonance imaging (MRI), some research groups have reported enlargement of the lateral...
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Physics of Magnetism Magnetic Materials 2011 Part 1 pps
Ngày tải lên :
12/08/2014, 01:21
... Recording Materials 13.1 Introduction 13.2 Magneto-Optical Recording Materials 13.3 Materials for High-Density Magnetic Recording References 131 131 133 139 145 CONTENTS vii Chapter 14 Soft- Magnetic Materials ... 14.2 Survey of Materials 14.3 The Random-Anisotropy Model 14.4 Dependence of Soft- Magnetic Properties on Grain Size 14.5 Head Materials and Their Applications 14.5.1 High-Density Magnetic- Induction ... on soft ferromagnetic objects The applications of magnetic materials in information technology are continuously growing In this treatment, a survey will be given of the most common modern magnetic...
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Physics of Magnetism Magnetic Materials 2011 Part 2 doc
Ngày tải lên :
12/08/2014, 01:21
... normal magnetic metals such as Fe, Co, Ni, and Gd, in which a high magnetization is already observed even without the application of a magnetic field These materials are called ferromagnetic materials ... on the magnetic behavior of a ferromagnetic material above In this case, the magnetic moments are no longer ferromagnetically ordered and the system is paramagnetic Therefore, we may use again ... distance (2.50 Å) occurring in the horizontal planes gives rise to ferromagnetic rather than antiferro magnetic interaction Antiferromagnetic interaction occurs between Fe moments separated by much...
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Physics of Magnetism Magnetic Materials 2011 Part 3 docx
Ngày tải lên :
12/08/2014, 01:21
... the most prominent magnetic materials are ferrimagnets For this reason, we will discuss the magnetic coupling in these materials in somewhat more detail We consider a ferrimagnetic compound consisting ... Buschow (Ed.) Handbook of magnetic materials, Amsterdam: North Holland Publ Co., Vol 6, p 181 Brooks, M S S and Johansson, B (1993) in K H J Buschow (Eds) Handbook of magnetic materials, Amsterdam: ... able to overcome the anti ferromagnetic coupling between the two sublattice moments This phenomenon is called metamagnetic transition 4.4 FERRIMAGNETISM In ferrimagnetic substances, in contrast...
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Physics of Magnetism Magnetic Materials 2011 Part 4 ppt
Ngày tải lên :
12/08/2014, 01:21
... statistical based on an equidistant level scheme (see Fig 3.1.1) Such a level scheme average of is not obtained when we apply a magnetic field to the situation shown in Fig 5.2.2 The magnetic field ... stating that if the magnetic flux enclosed by a current loop is changed by the application of a magnetic field, a current is induced in such a direction that the corresponding magnetic field opposes ... momentum of the electron before application of the magnetic field, we may consider the equivalent magnetic shell and write The change in the magnetic orbital moment due to the field is This equation...
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Physics of Magnetism Magnetic Materials 2011 Part 5 pps
Ngày tải lên :
12/08/2014, 01:21
... concentrated in paramagnetic materials, and strongly concentrated in ferromagnetic materials In diamagnetic and paramagnetic materials, small applied fields give rise to an internal magnetic induction ... ferromagnetic material, the internal magnetic induction is much larger than the external magnetic induction One may also say that the magnetic induction lines are diluted in diamagnetic materials, ... internal magnetic induction, is somewhat smaller By contrast, in a paramagnetic material, the than the external magnetic induction, internal magnetic induction is somewhat larger than the external magnetic...
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Physics of Magnetism Magnetic Materials 2011 Part 6 pdf
Ngày tải lên :
12/08/2014, 01:21
... IN MAGNETIC MATERIALS In the absence of the magnetic field, the 2J + energy states of each of the participating magnetic moments are degenerate For a system which contains N non-interacting magnetic ... page intentionally left blank 10 Caloric Effects in Magnetic Materials 10.1 THE SPECIFIC-HEAT ANOMALY It has been shown in Chapter that the magnetic susceptibility of ferromagnets, ferrimag nets, ... anomalously when the temperature in the paramagnetic range approaches the magnetic- ordering temperature In this section, it will be shown that the anomalies in magnetic behavior close to the ordering...
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Physics of Magnetism Magnetic Materials 2011 Part 7 pdf
Ngày tải lên :
12/08/2014, 01:21
... permanent magnets 12.5 MAGNETIC ANISOTROPY AND EXCHANGE COUPLING IN PERMANENT-MAGNET MATERIALS BASED ON RARE-EARTH COMPOUNDS The anisotropy in modern rare-earth -based magnet materials mentioned ... permanent-magnet materials and the coercivity is nucleation controlled A survey of various magnet materials is given in Table 12.5.1 Extremely high coercivi ties are attained in all materials based on ... reversal is the existence of magnetic- domain structures Magnetic particles of sufficiently large size will generally not be uniformly magnetized but rather be composed of magnetic domains that are...
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Physics of Magnetism Magnetic Materials 2011 Part 9 pptx
Ngày tải lên :
12/08/2014, 01:21
... Magn., 20, 675 This page intentionally left blank 14 Soft- Magnetic Materials 14.1 INTRODUCTION Soft- magnetic materials are mainly used in magnetic cores of transformers, motors, inductors, and ... anisotropy in various Fe -based soft- magnetic materials has been presented by Soinski and Moses (1995) 14.2 SURVEY OF MATERIALS Iron Electrical-grade steel is the soft- magnetic material employed ... expensive materials are more suitable Examples of such materials are Permalloy, Supermalloy, various types of amorphous alloys and nanocrystalline alloys Several important soft- magnetic materials...
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Physics of Magnetism Magnetic Materials 2011 Part 10 pdf
Ngày tải lên :
12/08/2014, 01:21
... with a width of 14.4 DEPENDENCE OF SOFT- MAGNETIC PROPERTIES ON GRAIN SIZE The grain-size dependence of the magnetic properties of various types of soft- magnetic materials is compared in Fig 14.4.1 ... two sections, both types of materials will be briefly discussed Soft- magnetic materials are widely employed for the fabrication of magnetic recording heads These materials must have a high saturation ... large in these nanocrystallrne materials It has already been mentioned briefly in Section 13.2 that magnetic domains of different 158 CHAPTER 14 SOFT- MAGNETIC MATERIALS magnetization direction...
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Physics of Magnetism Magnetic Materials 2011 Part 11 pot
Ngày tải lên :
12/08/2014, 01:21
... 94 magnetic- induction heads, 159 magnetic losses, 109, 147 magnetic- ordering, 21 magnetic permeability in vacuum, 75 magnetic polarization, 80 magnetic properties of iron-group elements, magnetic ... elements, magnetic quantum number, magnetic recording, 139 magnetic- recording medium, 139 magnetic splitting of the ground-multiplet, 16 magnetic susceptibility, 15, 65 magnetic tape, 143 magnetic ... a distribution of distorted magnetic domains present in the magnetically ordered material It is well known that fer romagnetic and ferrimagnetic materials adopt a magnetic domain structure with...
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Neutron Scattering from Magnetic Materials part 1 pps
Ngày tải lên :
12/08/2014, 02:23
... different aspects of neutron scattering from magnetic materials I intentionally chose the title “Neutron Scattering from Magnetic Materials rather than Magnetic Neutron Scattering” to emphasize ... illustrates the use of this technique for investigating nanocrystalline microstructures, soft magnetic materials, magnetic colloids, ferrofluids etc In Chapter 11 Pappas, Ehlers and Mezei describe the ... Magnetic neutron scattering 6.1 Scattering of neutrons from unpaired electrons 6.2 Scattering of neutrons from crystalline magnetic materials 6.3 Elastic magnetic...
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Neutron Scattering from Magnetic Materials part 2 doc
Ngày tải lên :
12/08/2014, 02:23
... new magnetic materials are usually synthesized as polycrystalline materials the magnetic structures are often determined from powder neutron diffraction If the ordered magnetic phase is ferromagnetic ... properties characterized by their response to an applied magnetic field or the magnetic susceptibility They are called magnetic materials Magnetic atoms are mainly situated in three rows of the ... net magnetic moment exists, then the structure is called ferrimagnetic In more complex antiferromagnetic phases the magnetic moments can have noncollinear arrangements In another class of magnetic...
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