Method for Changing the Direction of Magnetization in Ferromagnetic Layer

The invention relates to a method for changing the direction of magnetization in a top layer (2) including a ferromagnetic material, characterized in that: a) the top layer (2) is placed over a bottom layer (3) that is not magnetically coupled to the top layer (2), the bottom layer (3) including a material capable of producing or not producing, according to whether the temperature of said material is greater than or equal to a threshold value, a radiated magnetic field capable of changing the direction of magnetization of the top layer (2), the magnetic field radiated by the material of the bottom layer (3) being greater than the coercive field strength of the ferromagnetic material of the top layer (2), and in that the method includes: b) a step consisting of passing the temperature of the bottom layer (3) from a first value, for which the directions of magnetization of the top layer (2) and the bottom layer (3) are in a relatively stable configuration and for which the material of the bottom layer (3) does not produce any radiated magnetic field, to a second value, for which the material of the bottom layer (3) produces a radiated magnetic field capable of irreversibly changing the direction of magnetization of the top layer (2), and c) a step consisting of passing the temperature of the bottom layer (3) from the second value to a third value for which the material of the bottom layer (3) does not produce any radiated magnetic field, the temperature variation steps b) and c) being carried out without applying an external magnetic field.

Attached files:
WO 2011001068.jpg

Patents:
WO 2,011,001,068

Inventor(s): MARANGOLO MASSIMILIANO [FR]; SACCHI MAURIZIO [FR]

Type of Offer: Sale



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