Magnetic properties of [(CoP)soft/(NiP)am/(CoP)hard/(NiP)am]n superlattices

IF 2.8 3区物理与天体物理 Q2 PHYSICS, CONDENSED MATTER

Physica B-condensed Matter Pub Date : 2024-10-28 DOI:10.1016/j.physb.2024.416664

Gennadiy Patrin , Vitaly Orlov , Yaroslav Shiyan

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Abstract

We report on the results of experimental and theoretical studies of magnetic superlattices [(CoP)_soft/(NiP)_am/(CoP)_hard/(NiP)_am]_n (n = 1, 5, 10, 15, 20, 40, t_CoP = 5 nm, t_NiP = 2 nm) produced by electroless deposition method. Cross-section electron microscopy image shows the layers do not mix and the interfaces between the layers are not blurred. We found the behavior of the magnetic hysteresis loops is similar to the exchange spring. Three peaks of microwave absorption are observed in the electron magnetic resonance spectra. To explain this, a model of a three-sublattice magnet with long-range interlayer interaction due to magnetic proximity effect is proposed. A perpendicular magnetic anisotropy is formed at the interface between the magnetic and non-magnetic layers. The interlayer interaction between the nearest magnetically soft and hard (J₁) layers is found to be negative, the interaction between magnetically soft layers (J₂) is positive, while J₁ is about an order of magnitude greater than J₂.

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(CoP)软/(NiP)am/(CoP)硬/(NiP)am]n 超晶格的磁特性

我们报告了通过无电解沉积法制备的磁性超晶格[(CoP)软/(NiP)am/(CoP)硬/(NiP)am]n（n = 1, 5, 10, 15, 20, 40, tCoP = 5 nm, tNiP = 2 nm）的实验和理论研究结果。横截面电子显微镜图像显示，各层并不混合，层间的界面也不模糊。我们发现磁滞回线的行为与交换弹簧相似。在电子磁共振光谱中观察到三个微波吸收峰。为了解释这一现象，我们提出了一个由于磁接近效应而具有长程层间相互作用的三亚晶格磁体模型。在磁性层和非磁性层之间的界面上形成了垂直磁各向异性。最近的磁性软层和硬层之间的层间相互作用（J1）是负的，磁性软层之间的相互作用（J2）是正的，而 J1 比 J2 大一个数量级。

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来源期刊

Physica B-condensed Matter 物理-物理：凝聚态物理

CiteScore

4.90

自引率

7.10%

发文量

703

审稿时长

44 days

期刊介绍： Physica B: Condensed Matter comprises all condensed matter and material physics that involve theoretical, computational and experimental work. Papers should contain further developments and a proper discussion on the physics of experimental or theoretical results in one of the following areas: -Magnetism -Materials physics -Nanostructures and nanomaterials -Optics and optical materials -Quantum materials -Semiconductors -Strongly correlated systems -Superconductivity -Surfaces and interfaces