Abstract: A microparticle composition(s) comprising nanomagnetic particles and a matrix, wherein said microparticle composition(s) have a least one of the following properties: (a) a VAR of at least about 1 Watts/cm3 subject to appropriate field conditions; (b) a density of about 2.7 or less: or (c) a size of about 100 nm to about 200 microns.

Abstract: A magnetic material having a magnetic heating efficiency of at least 4.5×10−8 J.m/A.g in a cyclic magnetic field where the product of the amplitude and frequency of the applied field is less than or equal to 5×108 A/m.s, and the frequency of the applied filed is at least 20 kHz. The ideal magnetic material is characterized by a perfectly rectangular hysteresis loop, i.e. loop squareness of 1, with coercivity of 25 kA/m or less and high saturation magnetization. Preferably the magnetic material has a predominately cubic magnetic crystalline anisotropy. Preferably the magnetic material is a substituted magnetite (Fe3O4) or &ggr;-ferric oxide (&ggr;Fe2O3) crystalline lattice in which some of the iron atoms in that crystalline lattice have been substituted for one or more alternate metals atoms. Desirably, the metal atom is a member of the group: cobalt, zinc, nickel, manganese, magnesium, copper, chromium, gallium, cadmium.

Abstract: A method for site specific treatment of diseased tissue in a patient, comprising the steps of: (i) selecting at least a magnetic material which has a magnetic heating efficiency of at least about 4.5×10−8 J.m./A.g, when magnetic field conditions are equal to or less than about 7.5×107 A/s; (ii) delivering the magnetic material to diseased tissue in a patient; and (iii) exposing the magnetic material in the patient to a linear alternating magnetic field with a frequency of greater than about 10 kHz and a field strength such that the product of field strength, frequency and the radius of the exposed region is less than about 7.5×107 A/s to generate hysteresis heat in the diseased tissue.

Abstract: A method for site specific treatment of diseased tissue in a patient, comprising the steps of: (i) selecting at least a magnetic material which has a magnetic heating efficiency of at least about 4.5.times.10.sup.-8 J.m./A.g, when magnetic field conditions are equal to or less than about 7.5.times.10.sup.7 A/s; (ii) delivering the magnetic material to diseased tissue in a patient; and (iii) exposing the magnetic material in the patient to a linear alternating magnetic field with a frequency of greater than about 10 kHz and a field strength such that the product of field strength, frequency and the radius of the exposed region is less than about 7.5.times.10.sup.7 A/s to generate hysteresis heat in the diseased tissue.

Abstract: The present invention provides an improved method for treatment of diseased tissue, which comprises the steps of:(i) selecting at least a magnetic material which has a magnetic heating efficiency of at least about 4.5.times.10.sup.-8 J.m./A.g, when rotational magnetic field conditions are equal to or less than about 5.times.10.sup.8 A/m.s;(ii) delivering the magnetic material to a patient's diseased tissue; and(iii) exposing the magnetic material to a rotational magnetic field with a frequency of greater than about 10 kHz and a field strength selected such that the product of field strength, frequency and the radius of the exposed region is less than about 7.5.times.10.sup.7 A/s to generate hysteresis heat in the diseased tissue.