Nd₂Fe₁₄B/FeCo Anisotropic Nanocomposite Films with a Large Maximum Energy Product

Abstract

In the above article, one sentence was missing before "To overcome this problem, we attempt to…" in the last part of Paragraph 3. This paragraph should be expanded as follows: "The Mo spacer layer was used in Nd-Fe-B to control interfaces between tex-tured Nd-Fe-B/αFe phases. [18] Moderate coercivity (~8 kOe) could be restored and a maximum energy product of 25 MGOe was achieved, indicating that controlling the interfaces was one of the main diffi culties in fabricating textured nanocomposite magnets with high-performance. To overcome further this problem, we attempt to…" We also wish to add the following sentences at the end of Paragraph 3 to make a clear distinction between the signifi cance and scope of the two papers: "The previous work [18] demonstrates (1) the role of interfaces in fabricating anisotropic nanocomposite fi lms and (2) anisotropic behavior of exchange coupling in these fi lms. The signifi cance of the Advanced Materials article (adma.201202328) lies in two aspects: (1) excellent magnetic properties and (2) microstructure characterization of the novel Nd-rich/NdFeB core-shell structure. Excellent magnetic properties originate from: (1) controlled interfaces between the NdFeB and FeCo phase, (2) enhanced magnetic properties of the Nd-Fe-B single layer, (3) comparable thickness of NdFeB with that of FeCo, and (4) weakened exchange coupling between soft/hard magnetic layers."

Predicting the Future of Permanent-Magnet Materials

“…Aligned hard-soft nanocomposites continue to be an active research area [23], [24], [26], [27], in spite of the challenging processing requirements. In these structures, the soft-phase material improves the hard-magnetic performance the main phase, scarifying some anisotropy and coercivity but enhancing magnetization and energy product beyond that of the hard phase [12], [25].…”

Direct chemical synthesis of L10-FePtAu nanoparticles with high coercivity

“…[1][2][3][4][5][6][7][8][9][10] Recent studies indicate that NdFeB, 11 and hexagonal SmCo 12 -based alloy NPs are ideal building blocks for fabricating nanostructured permanent magnet due to strong ferromagnetism observed within their unique structure. However, rare-earth metal-based alloy NPs of SmCo and NdFeB are extremely difficult to prepare and stabilize due to the easy oxidation of Sm(0) and Nd(0) in the alloy structures.…”

Current Status of Research and Development toward Permanent Magnets Free from Critical Elements

“…The anisotropic nanocomposite permanent magnet specimens with impressive properties have been demonstrated only in well-designed multi-layered films of SmCo5/Fe-Co 73) and Nd2Fe14B/Fe-Co 74) at room temperature in which the crystallographic orientations and interfaces of constituent phases are well controlled. Magnetic properties of thin-film nanocomposite permanent magnets thus achieved are shown in Table 4.…”