Analyzing area partitions in magnetic nanowires

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

A very intriguing class of supplies are half metals comparable to La_2/3Sr_1/3MnO₃ (LSMO) which current full spin polarization, permitting their exploitation in spintronic gadgets. Nonetheless the resistance of a single area wall in half metals remained unknown. Now a staff 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 traditional ferromagnet comparable 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 (generally known as area wall magnetoresistance) could possibly be used to encode data in spintronic reminiscence gadgets.

But, their exploitation is hindered as a result of small adjustments in resistance noticed for regular ferromagnets. Of specific curiosity are manganite perovskites comparable to LSMO. These compounds current just one kind 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 technique. The scientists from Spain, France and Germany have fabricated nanowire-based gadgets enabling the nucleation of particular person magnetic area partitions. Magneto transport measurements in these gadgets 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 entails movie progress and nanofabrication, transport measurements, contact microscopy (MFM) imaging, theoretical simulations and the usage of superior characterization methods comparable to X-ray photoemission electron microscopy. The mixture of all kinds of various methods supplies a complete multi-facet view of a posh downside which has allowed to succeed in new insights right into a extremely debated open query.

The examine is revealed within the journal Superior Supplies.