Analyzing area partitions in magnetic nanowires


Spintronics at BESSY II: Domain walls in magnetic nanowires
a) XAS of the system, with the magnetic subject within the course of the nanowire however with the X-ray beam within the course of the contact wire. b-d) XMCD in the identical configuration. With this configuration the magnetization of the contact may be probed. These measurements along with those in Determine 2 permits to unequivocally outline the magnetization course in our system. Credit score: Superior Supplies (2023). DOI: 10.1002/adma.202211176

Magnetic domains partitions are recognized to be a supply {of electrical} resistance because of the issue for transport electron spins to comply with their magnetic texture. This phenomenon holds potential for utilization in spintronic units, the place {the electrical} resistance can differ based mostly on the presence or absence of a site wall.

A very intriguing class of supplies are half metals corresponding to La2/3Sr1/3MnO3 (LSMO) which current full spin polarization, permitting their 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 modifications 20 instances bigger than for a traditional ferromagnet corresponding to cobalt.

The magnetic area texture inherent to magnetic holds potential for spintronic functions. The in ferromagnets depends upon whether or not area partitions are or not current. This binary impact (often called area wall magnetoresistance) might be used to encode data in spintronic reminiscence units.

But, their exploitation is hindered because of the small modifications in resistance noticed for regular ferromagnets. Of explicit curiosity are manganite perovskites corresponding to LSMO. These compounds current just one sort of spin (full spin polarization) which may 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 units enabling the nucleation of particular person . Magneto transport measurements in these units present that the presence of a wall results in a rise of {the electrical} resistance of as much as 12%. In absolute phrases, the noticed change is 20 instances bigger than that reported for cobalt.

This work is the results of a longstanding collaboration which entails movie development and nanofabrication, transport measurements, contact microscopy (MFM) imaging, theoretical simulations and using superior characterization strategies corresponding to X-ray photoemission electron microscopy. The mix of all kinds of various strategies supplies a complete multi-facet view of a fancy drawback which has allowed to achieve new insights right into a extremely debated open query.

The examine is printed within the journal Superior Supplies.

Extra data:
Gloria Orfila et al, Massive Magnetoresistance of Remoted Area Partitions in LSMO Nanowires, Superior Supplies (2023). DOI: 10.1002/adma.202211176

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Analyzing area partitions in magnetic nanowires (2023, June 2)
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