Enhanced Magnetism in Field-Cooled [Ni80Fe20/Mn]3 Multilayers Studied Using Polarized Neutron Reflectometry

International Conference on Polarised Neutrons for Condensed Matter Investigations 2014

Uilhoorn, W.^1,2 ; Callori, S.J.^1,2,9 ; Cortie, D.L.^2,3 ; Su, H.-C.^4 ; Khaydukov, Y.^5,6 ; Lin, K.-W.^7 ; Klose, F.^2,8

School of Physics, University of New South Wales, Sydney

NSW

2052, Australia^1

Bragg Institute, Australian Nuclear Science and Technology Organization, Lucas-Heights

NSW

2234, Australia^2

Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong

NSW

2522, Australia^3

National Synchrotron Radiation Research Center, Hsinchu

30076, Taiwan^4

Max-Planck Institute for Solid State Research, Stuttgart

50769, Germany^5

Max-Planck Society Outstation, FRM-II, Garching

85748, Germany^6

Department of Materials Science and Engineering, National Chung Hsing University, Taichung

402, Taiwan^7

Department of Physics and Materials Science, City University of Hong Kong, Hong Kong, Hong Kong^8

Now at the Department of Physics, California State University San Bernardino, San Bernardino

CA, United States^9

关键词: Interfacial roughness;    Interfacial state;    Layer interfaces;    Magnetic depth profile;    Multi-layer system;    Polarized neutron reflectometry;    Zero field cooled measurements;    Zero-field-cooled;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/711/1/012005/pdf
DOI  :  10.1088/1742-6596/711/1/012005

来源: IOP

【 摘 要 】

Here, the interfacial magnetic coupling in an exchange biased [Ni80Fe20/Mn]3multilayer system has been studied using polarized neutron reflectometry. Previous results on this system indicate the importance of the coupling between the Fe-Mn and Ni-Mn orbitals at the layer interfaces. Magnetic depth profiles of the multilayer were measured at low temperatures under field-cooled and zero-field-cooled conditions. While no definitive interfacial state was found, a magnetic moment enhancement of roughly 20-30% in the applied field direction was observed throughout the bulk of the NiFe layers in the field-cooled state as compared to the zero-field-cooled measurements. The origin of this enhancement also likely stems from Fe-Mn and Ni-Mn orbital coupling, but due to the interfacial roughnesses of the sample, the areas where this coupling plays an important role is no longer confined to the interface.