Fabrication of L1-type FeCo ordered structure using a periodic Ni buffer layer

Hisaaki Ito,Tomoyuki Koganezawa,Masaki Mizuguchi,Masahiro Saito,Fumio Komori,Toshio Miyamachi,Masato Kotsugi

doi:10.1063/1.5079982

Hisaaki Ito, Tomoyuki Koganezawa + Show 5 more

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We experimentally prepared a ferromagnet with an L10-FeCo ordered structure by inserting a periodic buffer layer to suppress the B2 structural transition and to maintain the L10 structure. The sample was fabricated by utilizing a technique involving the deposition of alternating monoatomic layers using pulsed laser deposition (PLD). This technique was used to deposit a thin film of (7 ML-FeCo/3 ML-buffer)3, in which either Cu or Ni was utilized as buffer layer. We characterized the surface roughness, surface morphology, lattice structure, and magnetic properties of the specimens by RHEED, AFM, SR-XRD, and SQUID, respectively. As a result, we successfully confirmed the construction of the L10-FeCo superstructure with a periodic Ni buffer layer for the first time. Both the magnetic moment and magnetic anisotropy were also increased by replacing Cu with Ni.

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L10-type ordered ferromagnets have proven to be crucial materials toward the realization of the next-generation energy society and have found application as materials in spintronic devices and as the permanent magnets of electric vehicles
We demonstrated the fabrication of L10-FeCo by inserting a periodic Ni buffer layer from a fundamental viewpoint
We prepared the specimens by using pulsed laser deposition (PLD) to deposit alternating monoatomic layers, which is a powerful technique with which to grow a thin film or multilayers with atomic-scale precision

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INTRODUCTION

L10-type ordered ferromagnets have proven to be crucial materials toward the realization of the next-generation energy society and have found application as materials in spintronic devices and as the permanent magnets of electric vehicles. From the viewpoint of fundamental science, a large magnetic moment and large magnetic anisotropy would be required. A number of studies have been carried out on stress induced B2-FeCo.. We demonstrated the fabrication of L10-FeCo by inserting a periodic Ni buffer layer from a fundamental viewpoint. We prepared the specimens by using pulsed laser deposition (PLD) to deposit alternating monoatomic layers, which is a powerful technique with which to grow a thin film or multilayers with atomic-scale precision. We utilized Cu or Ni as a buffer layer to avoid the structurally catastrophic transition to the B2 structure and to maintain the L10 structure of FeCo, because of the small mismatch (1 %) between the interfaces of these two structures. The magnetic moment and magnetic anisotropy were evaluated by superconducting quantum interference device (SQUID)

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