Magnetization Reversal
AssigneeRadboud Universiteit Nijmegen
InventorsTheodorus Henricus Maria Rasing, Johan Mentink, Andrei Kirilyuk, Alexey Kimel, Richard Francis Llewelyn Evans, Roy William Chantrell, Thomas Andrew Ostler, Joseph Barker
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Abstract
A method of magnetization reversal, time stable ferrimagnetic material, a product and a domain comprising said material, a system for magnetization reversal, and information storage. Therein, a ferrimagnetic material is one in which magnetic moments of the atoms on different sublattices are opposed, as in antiferromagnetism; however, in ferrimagnetic materials, the opposing moments are unequal and a spontaneous magnetization remains.
Claims19
A method of magnetization suitable for reversal in a multi component magnetic system, the system comprising at least a first magnetic sub system and a second magnetic sub system, the first and second sub systems being coupled anti-ferromagnetically, the method comprising the steps of:
- a) applying a stimulus to the magnetic system thereby reversing at least one magnetic moment of the first sub system, wherein the stimulus is an ultrafast heat pulse and is applied during a period in a first magnetization reversal time domain, and
- b) relaxing and thereby reversing at least one magnetic moment of the second sub system, during a period in a second magnetization reversal time domain,
- wherein the first magnetization reversal time domain is at most 100 times smaller than the second magnetization reversal time domain.
Ferrimagnetic, antiferromagnetic or synthetic ferrimagnetic, or a combination thereof, high magnetic density multi-component system suitable for heat induced magnetization reversal, comprising at least two magnetic components, the system having a (T) temperature dominated regime, and an (E) exchange dominated regime, wherein
- i) at least two magnetic components (A,B) are coupled anti-ferromagnetically,
- ii) a first component (A) is characterized by a first relaxation time τ1, and
- iii) a second component (B) is characterized by a second relaxation time τ2,
- wherein τ1>1.1*τ2, and
- iv) wherein τ1<30 ps, preferably wherein τ1<1 ps.
Dependencies are inferred from the claim text.