Heat-assisted magnetization reversal using pulsed laser irradiation in patterned magnetic thin film with perpendicular anisotropy

Keita Waseda; Ryosuke Doi; Budi Purnama; Satoru Yoshimura; Yukio Nozaki; Kimihide Matsuyama

doi:10.1109/TMAG.2008.2003068

Heat-assisted magnetization reversal using pulsed laser irradiation in patterned magnetic thin film with perpendicular anisotropy

Keita Waseda
, Ryosuke Doi
, Budi Purnama
, Satoru Yoshimura
, Yukio Nozaki
, Kimihide Matsuyama

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

Cooling velocity of patterned Tb-Fe film with a lateral size of 50×50 μm2 was experimentally investigated for the application to heat-assisted writing operation in high-density magnetic random access memories. The patterned Tb-Fe film was heated-up by using pulsed YAG laser irradiations with the duration of 1 ns which is realizing a semi-adiabatic heating process. The ratio of magnetization reversal in the patterned Tb-Fe film was estimated by measuring an anomalous Hall voltage. The main results are as follows: (1) Magnetic field required for magnetization reversal of Tb-Fe film was decreased from 1.4 kOe to 200 Oe by applying the heat-assisted magnetization reversal method. (2) Cooling velocity of patterned Tb-Fe film can be estimated by using pulsed magnetic fields with various time delays from the pulsed laser irradiation. (3) With increasing the thermal conductivity coefficient of electrical leads, the velocity to cool the patterned Tb-Fe film increased.

Original language	English
Pages (from-to)	2483-2486
Number of pages	4
Journal	IEEE Transactions on Magnetics
Volume	44
Issue number	11 PART 1
DOIs	https://doi.org/10.1109/TMAG.2008.2003068
Publication status	Published - 2008 Nov
Externally published	Yes

Keywords

Cooling velocity
Heat-assisted magnetization reversal
Magnetic random access memory
Patterned magnetic film
Perpendicular magnetic anisotropy
Pulsed laser irradiation

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/TMAG.2008.2003068

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title = "Heat-assisted magnetization reversal using pulsed laser irradiation in patterned magnetic thin film with perpendicular anisotropy",

abstract = "Cooling velocity of patterned Tb-Fe film with a lateral size of 50×50 μm2 was experimentally investigated for the application to heat-assisted writing operation in high-density magnetic random access memories. The patterned Tb-Fe film was heated-up by using pulsed YAG laser irradiations with the duration of 1 ns which is realizing a semi-adiabatic heating process. The ratio of magnetization reversal in the patterned Tb-Fe film was estimated by measuring an anomalous Hall voltage. The main results are as follows: (1) Magnetic field required for magnetization reversal of Tb-Fe film was decreased from 1.4 kOe to 200 Oe by applying the heat-assisted magnetization reversal method. (2) Cooling velocity of patterned Tb-Fe film can be estimated by using pulsed magnetic fields with various time delays from the pulsed laser irradiation. (3) With increasing the thermal conductivity coefficient of electrical leads, the velocity to cool the patterned Tb-Fe film increased.",

keywords = "Cooling velocity, Heat-assisted magnetization reversal, Magnetic random access memory, Patterned magnetic film, Perpendicular magnetic anisotropy, Pulsed laser irradiation",

author = "Keita Waseda and Ryosuke Doi and Budi Purnama and Satoru Yoshimura and Yukio Nozaki and Kimihide Matsuyama",

note = "Funding Information: This work was supported in part by the Industrial Technology Research Grant Program in 2005 from the New Energy and Industrial Technology Development Organization (NEDO) of Japan and the Ministry of Education, Science, Sports and Culture, Grant-in-Aid for Young Scientists (A), 20686025.",

year = "2008",

month = nov,

doi = "10.1109/TMAG.2008.2003068",

language = "English",

volume = "44",

pages = "2483--2486",

journal = "IEEE Transactions on Magnetics",

issn = "0018-9464",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

number = "11 PART 1",

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TY - JOUR

T1 - Heat-assisted magnetization reversal using pulsed laser irradiation in patterned magnetic thin film with perpendicular anisotropy

AU - Waseda, Keita

AU - Doi, Ryosuke

AU - Purnama, Budi

AU - Yoshimura, Satoru

AU - Nozaki, Yukio

AU - Matsuyama, Kimihide

N1 - Funding Information: This work was supported in part by the Industrial Technology Research Grant Program in 2005 from the New Energy and Industrial Technology Development Organization (NEDO) of Japan and the Ministry of Education, Science, Sports and Culture, Grant-in-Aid for Young Scientists (A), 20686025.

PY - 2008/11

Y1 - 2008/11

N2 - Cooling velocity of patterned Tb-Fe film with a lateral size of 50×50 μm2 was experimentally investigated for the application to heat-assisted writing operation in high-density magnetic random access memories. The patterned Tb-Fe film was heated-up by using pulsed YAG laser irradiations with the duration of 1 ns which is realizing a semi-adiabatic heating process. The ratio of magnetization reversal in the patterned Tb-Fe film was estimated by measuring an anomalous Hall voltage. The main results are as follows: (1) Magnetic field required for magnetization reversal of Tb-Fe film was decreased from 1.4 kOe to 200 Oe by applying the heat-assisted magnetization reversal method. (2) Cooling velocity of patterned Tb-Fe film can be estimated by using pulsed magnetic fields with various time delays from the pulsed laser irradiation. (3) With increasing the thermal conductivity coefficient of electrical leads, the velocity to cool the patterned Tb-Fe film increased.

AB - Cooling velocity of patterned Tb-Fe film with a lateral size of 50×50 μm2 was experimentally investigated for the application to heat-assisted writing operation in high-density magnetic random access memories. The patterned Tb-Fe film was heated-up by using pulsed YAG laser irradiations with the duration of 1 ns which is realizing a semi-adiabatic heating process. The ratio of magnetization reversal in the patterned Tb-Fe film was estimated by measuring an anomalous Hall voltage. The main results are as follows: (1) Magnetic field required for magnetization reversal of Tb-Fe film was decreased from 1.4 kOe to 200 Oe by applying the heat-assisted magnetization reversal method. (2) Cooling velocity of patterned Tb-Fe film can be estimated by using pulsed magnetic fields with various time delays from the pulsed laser irradiation. (3) With increasing the thermal conductivity coefficient of electrical leads, the velocity to cool the patterned Tb-Fe film increased.

KW - Cooling velocity

KW - Heat-assisted magnetization reversal

KW - Magnetic random access memory

KW - Patterned magnetic film

KW - Perpendicular magnetic anisotropy

KW - Pulsed laser irradiation

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U2 - 10.1109/TMAG.2008.2003068

DO - 10.1109/TMAG.2008.2003068

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JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

IS - 11 PART 1

ER -

Heat-assisted magnetization reversal using pulsed laser irradiation in patterned magnetic thin film with perpendicular anisotropy

Abstract

Keywords

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