摘要:
The present invention relates to a microparticle (2) comprising: at least one oblong flexible tail (6), capable of propelling said microparticle (2) in a solution along a path by flapping movements transverse to the path, said tail being provided with at least one magnetic element for this purpose, such that said magnetic element causes the flapping movements of said tail (6) by means of an external alternating magnetic field that is non-collinear with the path; and a head (4) mechanically connected to the proximal end of the tail. The microparticle (2) comprises at least one layer of a material made of a single piece and including said tail (6) and said head (4), the size and/or shape of said head (4) being selected such that the flapping movements of the proximal end of said tail (6) are limited relative to the flapping movements of the distal end of the tail (6), and such that said head (4) does not perform a complete revolution about an axis parallel to the path when exposed to the external alternating magnetic field.
摘要:
The present invention relates to a magnetic recording medium (100). The invention finds a particularly interesting application in the field of data stored on hard disks. The medium (100) comprises an assembly of magnetic zones disposed on a substrate (102), each magnetic zone comprising at least one first (C'1 ) and one second (C'2) stacked magnetic layers separated from each other by a non-magnetic layer (NM'). In addition, said first magnetic layer (C'1 ) presents magnetization substantially oriented parallel to the plane of said substrate (102) and said second magnetic layer (C'2) presents magnetization substantially oriented perpendicular to the plane of said substrate (102).
摘要:
The invention essentially relates to a voltage-controlled spintronic device comprising: - a magnetic layer having an effective anisotropy K eff ; - a non-magnetic insulating layer; - a contact layer; said magnetic layer having an anisotropy switching threshold such that the application of a polarisation voltage Vmax allows switching of the effective anisotropy Keff from a direction perpendicular to the reference plane to a direction in the reference plane or vice versa, the magnetic layer comprising: - a first layer, with thickness tB, having a volume anisotropy KVB; - a second layer, with thickness tA, having a surface anisotropy KSA and a volume anisotropy KVA; the surface anisotropy KSA and the volume anisotropies KVA and KVB respecting, over a given operating temperature range, the following inequality: Min(KSA(V = 0), KSA(V = Vmax)) where KSA(V=0) is the surface anisotropy when no polarisation voltage is applied and KSA(V=Vmax) is the surface anisotropy when a polarisation voltage Vmax is applied.