Domain size criterion for the observation of all-optical helicity-dependent switching in magnetic thin films

被引：67

作者：

El Hadri, Mohammed Salah ^{[1
]}

Hehn, Michel ^{[1
]}

Pirro, Philipp ^{[1
]}

Lambert, Charles-Henri ^{[1
]}

Malinowski, Gregory ^{[1
]}

Fullerton, Eric E. ^{[2
]}

Mangin, Stephane ^{[1
]}

机构：

[1] Univ Lorraine, Inst Jean Lamour, UMR CNRS 7198, BP 70239, F-54506 Vandoeuvre Les Nancy, France

[2] Univ Calif San Diego, Ctr Magnet Recording Res, La Jolla, CA 92093 USA

来源：

PHYSICAL REVIEW B | 2016年 / 94卷 / 06期

关键词：

PERPENDICULAR ANISOTROPY; REVERSAL; FE; TB; GD; CO;

D O I：

10.1103/PhysRevB.94.064419

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

To understand the necessary condition for the observation of all-optical helicity-dependent switching (AOHDS) of magnetization in thin films, we investigated ferromagnetic Co/Pt and Co/Ni multilayers as well as ferrimagnetic TbCo alloys as a function of magnetic layer compositions and thicknesses. We show that both ferro-and ferrimagnets with high saturation magnetization show AO-HDS if their magnetic thickness is strongly reduced below a material-dependent threshold thickness. By taking into account the demagnetizing energy and the domain wall energy, we are able to define a criterion to predict whether AO-HDS or thermal demagnetization (TD) will be observed. This criterion for the observation of AO-HDS is that the equilibrium size of magnetic domains forming during the cooling process should be larger than the laser spot size. From these results we anticipate that more magnetic materials are expected to show AO-HDS. However, the effect of the optical pulses' helicity is hidden by the formation of small magnetic domains during the cooling process.

引用

页数：8

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