New Magnetic Materials

The identification and study of colossal magnetoresistance (CMR) materials could be amenable to combinatorial-style searches. Such approaches could be useful for elucidating the structural and electronic phase diagrams of these fascinating materials. Ultimately this could help sort out the apparently complex physics that underlies their behavior. An indication of the value of these approaches was recently provided by Xiang et al. [21] 

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Today, magnetic information carriers are widespread, and no other technology can compete in storage density and rate of access to stored data. Further improvement in performance requires the development of new magnetic materials with high saturation magnetic flux density, appropriate coercivity and suitable magnetic characteristics. 

Itokh, K. Kinoshita, M. (2001) Molecular Magnetism New Magnetic Materials, Kodansha and Gordon Breach, Tokyo and Amsterdam. 

Another area with a large research activity is also related to computer technology. It is electrodeposition of magnetic alloys for thin-film recording heads and magnetic storage media. Here new magnetic materials are needed that have properties superior to those of electrodeposited NiEe (Permalloy). These activities are reviewed by Andricacos and Romankiw (25) and Romankiw (32). 

Robinson, A.L. Powerful New Magnet Material Found, Science, 223, 920-922 (1981). 

To search for new magnetic materials in C60-based charge-transfer systems, one needs to look for cases where Jahn-Teller-distorted orientationally ordered Qo ions occupy noncubic sites. It would be very interesting to test the magnetic properties of doped smaller fullerides, i.e., C with n<60, as one expects larger exchange couplings in these systems. Another direction would be to search... 

K. Itoh and M. Kinoshita (Eds.), Molecular Magnetism, New Magnetic Materials, Gordon and Breach, Amsterdam, 2000. 

Langmuir-Blodgett-Films - Toward New Magnetic- Materials Thin solidfilms 327-329 439 (1998). 

Kim, T. K., and Takahashi, M., New magnetic material having ultrahigh magnetic moment, J. Appl. Phys. Lett., 20, 492 (1972). 

Ferrites have become a reference material developments associated with other new magnetic materials, such as the extra-hard rare-earth inter-metallics (Buschow, 1990), or the extra-soft amorphous ribbons (Boll Hilzinger, 1983) are often assessed by comparison with ferrites. 

The search for new magnetic materials as described in the last section may be looked upon as a typical example of the chemist s orthodox strategy Namely, take your existing compound, analyze the interactions between the atoms, understand them using some theoretical framework - and then move on to rationally synthesize yet another compound with a new composition Making new compounds is at the heart of chemistry, and chemists really love to fabricate them. And yet, there are other ways of arriving at new materials. 

J. Chatterjee, Y. Haik, C.J. Chen, Polyethylene magnetic nanoparticle a new magnetic material for biomedical applications. J. Magn. Magn. Mater. 246, 382-391 (2002)... 

The stabilization of nano-sized magnetic particles is a key problem and rrray be solved by their incorporation in oligomer or polymer matrixes—one of the possible ways applicable for preparation of new magnetic materials [1, 2]. 

Condensed clusters separated by nonmetal atoms, or ligand stabilized clusters in crystal or pellet forms, and composed of appropriate elements, may lead to important new magnetic materials. 

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