Investigation of New Soft Magnetic Films for GHz Magnetic Recording Heads and Integrated Inductors

GHz 磁记录头和集成电感器用新型软磁薄膜的研究

• 批准号: 0096704
• 负责人: Shan Wang
• 金额: $ 28.95万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-04-15 至 2005-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0096704&HistoricalAwards=false
• 关键词: Investigation; New; Soft; Magnetic; Films

Soft magnetic films with low coercivity and high permeability are critical building blocks in numerous electromagnetic devices such as magnetic recording heads, integrated inductors (microinductors), integrated transformers, magnetic sensors, and micromachined motors. However, a lack of soft magnetic materials with a high saturation magnetization (20 kG), a large permeability (1000), and a large ferromagnetic resonance frequency (1 GHz), tends to be the bottleneck in these applications. For example, the data rate of hard disk drives is expected to be ~1 Gb/s (1 Gb = 1 billion bits) by year 2003. A data rate of 2 Gb/s corresponds to a recording frequencies of ~1 GHz, which exceeds the ferromagnetic resonance (FMR) frequency of most magnetic materials. Therefore, it is increasingly urgent to investigate new materials, magnetization dynamics, and recording physics which will enable magnetic recording at a frequency of 1 GHz. In this project, we propose the following: 1) Investigate a new soft magnetic material, namely Fe-Co-N films (FeCoN) with a saturation magnetization of ~24 kG, which will enable higher areal recording densities in hard disk drives (100 Gb per square inch). 2) Study magnetization dynamics and magnetic recording at 1 GHz, an important milestone if reduced to practice. 3) Evaluate the viability of the new FeCoN material for integrated inductors, which are desired for emerging applications such as portable wireless communication devices. 4) Educate graduate students and undergraduates about information storage technology via doctoral thesis research, research experience for under graduate (REU), and classroom teaching.

具有低矫顽力和高磁导率的软磁薄膜是许多电磁设备的关键组成部分，例如磁记录头、集成电感器（微电感器）、集成变压器、磁传感器和微机械电机。 然而，缺乏具有高饱和磁化强度（20 kG）、大磁导率（1000）和大铁磁共振频率（1 GHz）的软磁材料往往成为这些应用的瓶颈。例如，到 2003 年，硬盘驱动器的数据速率预计将达到约 1 Gb/s（1 Gb = 10 亿位）。2 Gb/s 的数据速率对应于约 1 GHz 的记录频率，该频率超过了大多数磁性材料的铁磁共振 (FMR) 频率。因此，研究新材料、磁化动力学和记录物理以实现 1 GHz 频率的磁记录变得越来越紧迫。在这个项目中，我们提出以下建议：1）研究一种新型软磁材料，即饱和磁化强度约为24 kG的Fe-Co-N薄膜（FeCoN），这将使硬盘驱动器具有更高的面记录密度（每平方英寸100 Gb）。 2) 研究 1 GHz 下的磁化动力学和磁记录，如果付诸实践，这是一个重要的里程碑。 3) 评估用于集成电感器的新型 FeCoN 材料的可行性，这种材料是便携式无线通信设备等新兴应用所需要的。 4）通过博士论文研究、本科生研究经验（REU）和课堂教学，对研究生和本科生进行信息存储技术教育。