Download Micromagnetics and Recording Materials by Dan Wei PDF

By Dan Wei

"Micromagnetics and Recording fabrics" is a booklet attempting to supply a scientific idea of computational utilized magnetism, in accordance with Maxwell equations of fields and Landau-Lifshitz equations of magnetic moments. The centred magnetic fabrics are magnetic recording fabrics used in laptop harddisk drives. regularly, “Micromagnetics” comprises the parts of “magnetization curve theory", “domain concept" and “read and write method analyses in recording systems”. As Springer Briefs, this publication contains the 1st components of micromagnetics. M-H loops of tough magnetic skinny movie media, tender magnetic layers and Tunneling MagnetoResistive spin valves are solved in keeping with the microstructures of skinny motion pictures. Static area buildings and dynamic switching procedures are analyzed within the arbitrary-shaped magnetic units akin to write head pole assistance and magnetic strength microscope suggestions. The e-book is meant for researchers who're attracted to utilized magnetism and magnetic recording in all disciples of actual science.

Prof. Dan Wei works at Tsinghua collage, China.

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Sample text

In Eq. 60), the sum over r is taken over micromagnetic cells discretized at a distance D in any dimension, similar to Eq. 59). When r = r, the term in the sum −Bs N˜ (r, r) · m(r) ˆ is called the shape anisotropy field, whose expression is actually more complicated due to the constraint mˆ 2 = 1; however we will prove that it is equivalent to the term here when used in LL equations. As discussed in Sect. 2, sometimes the micromagnetic is not a simple cube, but a polyhedron, then the demagnetizing matrix N˜ should be calculated following a formula similar to Eq.

B. S. Pergamon Press, Oxford (1960) 2. : Structure and energy of one-dimensional domain walls in ferromagnetic thin films. J. Appl. Phys. 36(4), 1380–1386 (1965) 3. : A Treatise on Electricity and Magnetism (1873), translated by Ge G. into Chinese. Wuhan Press, Wuhan (1994) 4. : Geschichte der Physik (1950), translated by Fan D. N. Z. into Chinese. Commercial Press, Beijing (1978) 5. : Micromagnetics of ferromagnetic nano-devices using fast fourier transform method. IEEE Trans. Magn. 45(8), 3035–3045 (2009) 6.

Modern ferromagnetic devices are mostly made by thin films, as introduced in Sect. 3. To discretize an arbitrary-shaped device into micromagnetic cells, there are two basic classes for the geometry of cells: cuboid or cubic cell in the main body, and triangular prism cells at the edge, as seen in Fig. 3. The demagnetizing matrices of either cells can be calculated by Eq. 37), with a sum of contributions from all surfaces of the cell. The demagnetizing matrix of a cuboid cell with a size a × b × c can be integrated out directly [6].

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