Abstract
Ferrimagnetic thin films formerly played a very important role in the development of information storage technology. Now they are again at the forefront of the rising field of spintronics. From new, more efficient magnetic recording media and sensors based on spin valves to the promising technologies envisaged by all-optical switching, ferrimagnets offer singular properties that deserve to be studies both from the point of view of fundamental physics and for applications. In this review, we will focus on ferrimagnetic thin films based on the combination of rare earths (RE) and transition metals (TM).
Highlights
The technological advance that has taken place since the middle of the 20th century cannot be understood without taking into account the role played by different systems of storage information
90% of information storage technologies are based on magnetic materials in thin film or multilayered (ML) form [1]
The times associated with the transfer of heat between the above-mentioned reservoirs and the width of the laser pulse are the key for the switching to symmetry-breaking effects that can account for the deterministic toggle of magnetization
Summary
The technological advance that has taken place since the middle of the 20th century cannot be understood without taking into account the role played by different systems of storage information. The ordering of the moments in the layers changes from a natural high-resistance antiparallel arrangement at zero field to a less resistive parallel state when a moderate field is externally applied This phenomenon is enough to fabricate a sensor (called a spin valve) that can detect the magnetic state of a bit in a small region of a hard disk, thereby giving access to the information previously written. The latter configuration reduces the repelling forces between bits perpendicular to the surface of the disk, respectively The latter configuration reduces the repelling forces between bits and enables higher write magnetic fields, allowing higher areal recording densities.
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