360° domain walls in magnetic thin films with uniaxial and random anisotropy

被引：8

作者：

Chowdhury, N. ^{[1
,9
]}

Kleemann, W. ^{[2
]}

Petracic, O. ^{[3
,4
]}

Kronast, F. ^{[5
]}

Doran, A. ^{[6
]}

Scholl, A. ^{[6
]}

Cardoso, S. ^{[7
,8
]}

Freitas, P. ^{[7
,8
]}

Bedanta, S. ^{[1
]}

机构：

[1] HBNI, Lab Nanomagnetism & Magnet Mat, Sch Phys, Natl Inst Sci Educ & Res, Jatni 752050, India

[2] Univ Duisburg Essen, Angew Phys, D-47048 Duisburg, Germany

[3] JARA FIT Forschungszentrum Julich GmbH, Julich Ctr Neutron Sci, D-52425 Julich, Germany

[4] JARA FIT Forschungszentrum Julich GmbH, Peter Grunberg Inst, D-52425 Julich, Germany

[5] Helmholtz Zentrum Berlin Mat & Energie, Albert Einstein Str 15, D-12489 Berlin, Germany

[6] Lawrence Berkeley Natl Lab, Adv Light Source, 1 Cyclotron Rd, Berkeley, CA 94720 USA

[7] Univ Lisbon, INESC Microsyst & Nanotechnol, P-1000 Lisbon, Portugal

[8] Univ Lisbon, Inst Super Tecn, P-1000 Lisbon, Portugal

[9] Indian Inst Technol Delhi, Dept Phys, New Delhi 110016, India

来源：

PHYSICAL REVIEW B | 2018年 / 98卷 / 13期

关键词：

MAGNETORESISTANCE; MICROSCOPY; FERROMAGNETS;

D O I：

10.1103/PhysRevB.98.134440

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

X-ray photoemission electron microscopy (XPEEM) and magneto-optic Kerr effect (MOKE) microscopy have been performed on a metal-insulator multilayer of [Co80Fe20 (t = 1.8 nm)/Al2O3 (3 nm)(9) to image 360 degrees domain walls (DWs) along easy and hard axes, respectively. Their creation and annihilation can be directly visualized under application of a magnetic field. XPEEM experiments and micromagnetic simulations show that 360 degrees DWs occur through the merger of 180 degrees DWs of opposite chiralities along the easy axis. They are stable even under application of large magnetic fields. Formation of 360 degrees DWs observed along the hard axis is attributed to symmetry breaking of the coherent spin rotation. Their formation in metal-insulator multilayers is explained as being due to the presence of an orientational dispersion of anisotropy axes in the film grains that is comparable to an overall uniaxial anisotropy term. Our results are confirmed numerically using micromagnetic simulations.

引用

页数：7

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