Tuning ferromagnetism at room temperature by visible light

Proceedings of the National Academy of Sciences of the United States of America
B NáfrádiEndre Horváth

Abstract

Most digital information today is encoded in the magnetization of ferromagnetic domains. The demand for ever-increasing storage space fuels continuous research for energy-efficient manipulation of magnetism at smaller and smaller length scales. Writing a bit is usually achieved by rotating the magnetization of domains of the magnetic medium, which relies on effective magnetic fields. An alternative approach is to change the magnetic state directly by acting on the interaction between magnetic moments. Correlated oxides are ideal materials for this because the effects of a small external control parameter are amplified by the electronic correlations. Here, we present a radical method for reversible, light-induced tuning of ferromagnetism at room temperature using a halide perovskite/oxide perovskite heterostructure. We demonstrate that photoinduced charge carriers from the [Formula: see text] photovoltaic perovskite efficiently dope the thin [Formula: see text] film and decrease the magnetization of the ferromagnetic state, allowing rapid rewriting of the magnetic bit. This manipulation could be accomplished at room temperature; hence this opens avenues for magnetooptical memory devices.

References

May 15, 1995·Physical Review. B, Condensed Matter·A UrushibaraY Tokura
Dec 13, 2006·Physical Review Letters·V PeñaIvan K Schuller
Jun 5, 2007·Nature Materials·A BrinkmanH Hilgenkamp
Aug 4, 2007·Science·N ReyrenJ Mannhart
Apr 28, 2009·Physical Review Letters·Anoop Singh DhootRichard Henry Friend
Oct 14, 2014·Scientific Reports·Hee Taek YiVitaly Podzorov
Sep 26, 2015·Scientific Reports·Ignasi FinaMarin Alexe
Jan 26, 2016·Scientific Reports·Massimo SpinaEndre Horváth
Nov 25, 2016·Nature Communications·B NáfrádiE Horváth

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Citations

Dec 23, 2020·ACS Applied Materials & Interfaces·Yifan ZhaoZiyao Zhou
Aug 26, 2020·ACS Applied Materials & Interfaces·Shishun ZhaoMing Liu

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