Analyzing area partitions in magnetic nanowires

Magnetic domains partitions are identified to be a supply {of electrical} resistance because of the issue for transport electron spins to observe their magnetic texture. This phenomenon holds potential for utilization in spintronic units, the place {the electrical} resistance can range primarily based on the presence or absence of a website wall.

A very intriguing class of supplies are half metals equivalent to La_2/3Sr_1/3MnO₃ (LSMO) which current full spin polarization, permitting their exploitation in spintronic units. Nonetheless the resistance of a single area wall in half metals remained unknown. Now a group from Spain, France and Germany has generated a single area wall on a LSMO nanowire and measured resistance adjustments 20 occasions bigger than for a standard ferromagnet equivalent to cobalt.

The magnetic area texture inherent to magnetic area partitions holds potential for spintronic functions. The electrical resistance in ferromagnets will depend on whether or not area partitions are or not current. This binary impact (often known as area wall magnetoresistance) could possibly be used to encode data in spintronic reminiscence units.

But, their exploitation is hindered because of the small adjustments in resistance noticed for regular ferromagnets. Of specific curiosity are manganite perovskites equivalent to LSMO. These compounds current just one sort of spin (full spin polarization) which might probably result in area wall magnetoresistance results massive sufficient to be exploited in a brand new era of spintronic sensors and injectors.

Regardless of this promising perspective, there exist massive discrepancies within the reported values of the area wall magnetoresistance for this method. The scientists from Spain, France and Germany have fabricated nanowire-based units enabling the nucleation of particular person magnetic area partitions. Magneto transport measurements in these units present that the presence of a area wall results in a rise of {the electrical} resistance of as much as 12%. In absolute phrases, the noticed resistance change is 20 occasions bigger than that reported for cobalt.

This work is the results of a longstanding collaboration which includes movie progress and nanofabrication, transport measurements, contact microscopy (MFM) imaging, theoretical simulations and using superior characterization methods equivalent to X-ray photoemission electron microscopy. The mixture of all kinds of various methods offers a complete multi-facet view of a posh drawback which has allowed to succeed in new insights right into a extremely debated open query.

The examine is printed within the journal Superior Supplies.