Fingerprint of vortexlike flux closure in an isotropic Nd-Fe-B bulk magnet

被引:4
|
作者
Bersweiler, Mathias [1 ]
Oba, Yojiro [2 ]
Sinaga, Evelyn Pratami [1 ]
Peral, Inma [1 ]
Titov, Ivan [1 ]
Rai, Venus [1 ]
Metlov, Konstantin L. [3 ]
Michels, Andreas [1 ]
机构
[1] Univ Luxembourg, Dept Phys & Mat Sci, 162a Ave Faiencerie, L-1511 Luxembourg, Luxembourg
[2] Japan Atom Energy Agcy, Mat Sci Res Ctr, 2-4 Shirakata, Tokai, Ibaraki 3191195, Japan
[3] Inst Numer Math RAS, 8 Gubkina St,GSP-1, Moscow 119991, Russia
基金
俄罗斯科学基金会;
关键词
SANS;
D O I
10.1103/PhysRevB.108.094434
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Taking advantage of recent progress in neutron instrumentation and in the understanding of magnetic-fielddependent small-angle neutron scattering, we study the three-dimensional magnetization distribution within an isotropic Nd-Fe-B bulk magnet. The magnetic neutron scattering cross section of this system features the so-called spike anisotropy, which points toward the presence of a strong magnetodipolar interaction. This experimental result combined with the damped oscillatory behavior of the corresponding correlation function and recent micromagnetic simulation results on spherical nanoparticles suggest an interpretation of the neutron data in terms of vortexlike flux-closure patterns. The field-dependent correlation length Lc is well reproduced by a phenomenological power-law model. While the experimental neutron data for Lc are described by an exponent close to unity (p = 0.86), the simulation results yield p = 1.70, posing a challenge to theory to include vortex-vortex interaction effects.
引用
收藏
页数:7
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